diff --git a/CHANGELOG.md b/CHANGELOG.md
index d81d746d..6c1ffe8f 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -135,7 +135,7 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/).
 * Refactored the interface for `egui::app::App`.
 * Windows are now constrained to the screen.
 * `Context::begin_frame()` no longer returns a `Ui`. Instead put your widgets into a `SidePanel`, `TopPanel`, `CentralPanel`, `Window` or `Area`.
-* `Context::end_frame()` now returns paint commands that need to be converted to triangles with `Context::tesselate()`.
+* `Context::end_frame()` now returns paint commands that need to be converted to triangles with `Context::tessellate()`.
 * Anti-aliasing is now off by default in debug builds.
 
 ### Removed 🔥
@@ -153,7 +153,7 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/).
 * Unicode characters in labels (limited by [what the default font supports](https://fonts.google.com/specimen/Comfortaa#glyphs))
 * Simple drop-down combo box menu
 * Logarithmic sliders
-* Optimization: coarse culling in the tesselator
+* Optimization: coarse culling in the tessellator
 * CHANGED: switch argument order of `ui.checkbox` and `ui.radio`
 
 ## 0.1.4 - 2020-09-08
diff --git a/README.md b/README.md
index 8d7b663b..820bcdbe 100644
--- a/README.md
+++ b/README.md
@@ -131,7 +131,7 @@ Loop:
 
 * Gather input (mouse, touches, keyboard, screen size, etc) and give it to Egui
 * Run application code (Immediate Mode GUI)
-* Tell Egui to tesselate the frame graphics to a triangle mesh
+* Tell Egui to tessellate the frame graphics to a triangle mesh
 * Render the triangle mesh with your favorite graphics API (see [OpenGL example](https://github.com/emilk/egui/blob/master/egui_glium/src/painter.rs))
 
 ## Integrations
@@ -174,7 +174,7 @@ loop {
     egui_ctx.begin_frame(raw_input);
     my_app.ui(&mut egui_ctx); // add panels, windows and widgets to `egui_ctx` here
     let (output, paint_commands) = egui_ctx.end_frame();
-    let paint_jobs = egui_ctx.tesselate(paint_commands); // create triangles to paint
+    let paint_jobs = egui_ctx.tessellate(paint_commands); // create triangles to paint
     my_integration.paint(paint_jobs);
     my_integration.set_cursor_icon(output.cursor_icon);
     // Also see `egui::Output` for more
diff --git a/egui/benches/benchmark.rs b/egui/benches/benchmark.rs
index d0cb5e9f..28253aa0 100644
--- a/egui/benches/benchmark.rs
+++ b/egui/benches/benchmark.rs
@@ -38,8 +38,8 @@ pub fn criterion_benchmark(c: &mut Criterion) {
         demo_windows.ui(&ctx, &Default::default(), &mut None, |_ui| {});
         let (_, paint_commands) = ctx.end_frame();
 
-        c.bench_function("tesselate", |b| {
-            b.iter(|| ctx.tesselate(paint_commands.clone()))
+        c.bench_function("tessellate", |b| {
+            b.iter(|| ctx.tessellate(paint_commands.clone()))
         });
     }
 
diff --git a/egui/src/context.rs b/egui/src/context.rs
index cdc14661..a094e04c 100644
--- a/egui/src/context.rs
+++ b/egui/src/context.rs
@@ -17,7 +17,7 @@ struct Options {
     /// The default style for new `Ui`:s.
     style: Arc<Style>,
     /// Controls the tessellator.
-    tesselation_options: paint::TesselationOptions,
+    tessellation_options: paint::TessellationOptions,
     /// Font sizes etc.
     font_definitions: FontDefinitions,
 }
@@ -577,7 +577,7 @@ impl Context {
     /// Call at the end of each frame.
     /// Returns what has happened this frame (`Output`) as well as what you need to paint.
     /// You can transform the returned paint commands into triangles with a call to
-    /// `Context::tesselate`.
+    /// `Context::tessellate`.
     #[must_use]
     pub fn end_frame(&self) -> (Output, Vec<(Rect, PaintCmd)>) {
         if self.input.wants_repaint() {
@@ -601,14 +601,14 @@ impl Context {
         self.graphics().drain(memory.areas.order()).collect()
     }
 
-    /// Tesselate the given paint commands into triangle meshes.
-    pub fn tesselate(&self, paint_commands: Vec<(Rect, PaintCmd)>) -> PaintJobs {
-        let mut tesselation_options = self.options.lock().tesselation_options;
-        tesselation_options.aa_size = 1.0 / self.pixels_per_point();
+    /// Tessellate the given paint commands into triangle meshes.
+    pub fn tessellate(&self, paint_commands: Vec<(Rect, PaintCmd)>) -> PaintJobs {
+        let mut tessellation_options = self.options.lock().tessellation_options;
+        tessellation_options.aa_size = 1.0 / self.pixels_per_point();
         let paint_stats = PaintStats::from_paint_commands(&paint_commands); // TODO: internal allocations
         let paint_jobs = tessellator::tessellate_paint_commands(
             paint_commands,
-            tesselation_options,
+            tessellation_options,
             self.fonts(),
         );
         *self.paint_stats.lock() = paint_stats.with_paint_jobs(&paint_jobs);
@@ -732,9 +732,9 @@ impl Context {
         CollapsingHeader::new("✒ Painting")
             .default_open(true)
             .show(ui, |ui| {
-                let mut tesselation_options = self.options.lock().tesselation_options;
-                tesselation_options.ui(ui);
-                self.options.lock().tesselation_options = tesselation_options;
+                let mut tessellation_options = self.options.lock().tessellation_options;
+                tessellation_options.ui(ui);
+                self.options.lock().tessellation_options = tessellation_options;
             });
     }
 
@@ -849,7 +849,7 @@ impl Context {
     }
 }
 
-impl paint::TesselationOptions {
+impl paint::TessellationOptions {
     pub fn ui(&mut self, ui: &mut Ui) {
         let Self {
             aa_size: _,
diff --git a/egui/src/demos/app.rs b/egui/src/demos/app.rs
index 2c278808..985b2a7e 100644
--- a/egui/src/demos/app.rs
+++ b/egui/src/demos/app.rs
@@ -87,7 +87,7 @@ impl FrameHistory {
             1e3 * self.mean_frame_time()
         ))
         .on_hover_text(
-            "Includes Egui layout and tesselation time.\n\
+            "Includes Egui layout and tessellation time.\n\
             Does not include GPU usage, nor overhead for sending data to GPU.",
         );
         crate::demos::warn_if_debug_build(ui);
diff --git a/egui/src/lib.rs b/egui/src/lib.rs
index 21a9ee85..25babb79 100644
--- a/egui/src/lib.rs
+++ b/egui/src/lib.rs
@@ -27,7 +27,7 @@
 //!     egui_ctx.begin_frame(raw_input);
 //!     my_app.ui(&egui_ctx); // add panels, windows and widgets to `egui_ctx` here
 //!     let (output, paint_commands) = egui_ctx.end_frame();
-//!     let paint_jobs = egui_ctx.tesselate(paint_commands); // create triangles to paint
+//!     let paint_jobs = egui_ctx.tessellate(paint_commands); // create triangles to paint
 //!     my_integration.paint(paint_jobs);
 //!     my_integration.set_cursor_icon(output.cursor_icon);
 //!     // Also see `egui::Output` for more
@@ -143,7 +143,7 @@ fn test_egui_e2e() {
         ctx.begin_frame(raw_input.clone());
         demo_windows.ui(&ctx, &Default::default(), &mut None, |_ui| {});
         let (_output, paint_commands) = ctx.end_frame();
-        let paint_jobs = ctx.tesselate(paint_commands);
+        let paint_jobs = ctx.tessellate(paint_commands);
         assert!(!paint_jobs.is_empty());
     }
 }
diff --git a/egui/src/paint/mod.rs b/egui/src/paint/mod.rs
index 7d28586d..0b1c94fe 100644
--- a/egui/src/paint/mod.rs
+++ b/egui/src/paint/mod.rs
@@ -1,4 +1,4 @@
-//! 2D graphics/rendering. Fonts, textures, color, geometry, tesselation etc.
+//! 2D graphics/rendering. Fonts, textures, color, geometry, tessellation etc.
 
 pub mod color;
 pub mod command;
@@ -16,7 +16,7 @@ pub use {
     galley::*,
     stats::PaintStats,
     tessellator::{
-        PaintJob, PaintJobs, TesselationOptions, TextureId, Triangles, Vertex, WHITE_UV,
+        PaintJob, PaintJobs, TessellationOptions, TextureId, Triangles, Vertex, WHITE_UV,
     },
     texture_atlas::{Texture, TextureAtlas},
 };
diff --git a/egui/src/paint/tessellator.rs b/egui/src/paint/tessellator.rs
index 5bd3c05d..25ea04b2 100644
--- a/egui/src/paint/tessellator.rs
+++ b/egui/src/paint/tessellator.rs
@@ -273,7 +273,7 @@ pub struct PathPoint {
 
 /// A connected line (without thickness or gaps) which can be tessellated
 /// to either to a stroke (with thickness) or a filled convex area.
-/// Used as a scratch-pad during tesselation.
+/// Used as a scratch-pad during tessellation.
 #[derive(Clone, Debug, Default)]
 struct Path(Vec<PathPoint>);
 
@@ -445,9 +445,9 @@ pub enum PathType {
 }
 use self::PathType::{Closed, Open};
 
-/// Tesselation quality options
+/// Tessellation quality options
 #[derive(Clone, Copy, Debug)]
-pub struct TesselationOptions {
+pub struct TessellationOptions {
     /// Size of a pixel in points, e.g. 0.5
     pub aa_size: f32,
     /// Anti-aliasing makes shapes appear smoother, but requires more triangles and is therefore slower.
@@ -461,7 +461,7 @@ pub struct TesselationOptions {
     pub debug_ignore_clip_rects: bool,
 }
 
-impl Default for TesselationOptions {
+impl Default for TessellationOptions {
     fn default() -> Self {
         Self {
             aa_size: 1.0,
@@ -473,11 +473,11 @@ impl Default for TesselationOptions {
     }
 }
 
-/// Tesselate the given convex area into a polygon.
+/// Tessellate the given convex area into a polygon.
 fn fill_closed_path(
     path: &[PathPoint],
     color: Srgba,
-    options: TesselationOptions,
+    options: TessellationOptions,
     out: &mut Triangles,
 ) {
     if color == color::TRANSPARENT {
@@ -518,12 +518,12 @@ fn fill_closed_path(
     }
 }
 
-/// Tesselate the given path as a stroke with thickness.
+/// Tessellate the given path as a stroke with thickness.
 fn stroke_path(
     path: &[PathPoint],
     path_type: PathType,
     stroke: Stroke,
-    options: TesselationOptions,
+    options: TessellationOptions,
     out: &mut Triangles,
 ) {
     if stroke.width <= 0.0 || stroke.color == color::TRANSPARENT {
@@ -665,16 +665,16 @@ fn mul_color(color: Srgba, factor: f32) -> Srgba {
 
 // ----------------------------------------------------------------------------
 
-/// Tesselate a single [`PaintCmd`] into a [`Triangles`].
+/// Tessellate a single [`PaintCmd`] into a [`Triangles`].
 ///
-/// * `command`: the command to tesselate
-/// * `options`: tesselation quality
+/// * `command`: the command to tessellate
+/// * `options`: tessellation quality
 /// * `fonts`: font source when tessellating text
 /// * `out`: where the triangles are put
 /// * `scratchpad_path`: if you plan to run `tessellate_paint_command`
 ///    many times, pass it a reference to the same `Path` to avoid excessive allocations.
 fn tessellate_paint_command(
-    options: TesselationOptions,
+    options: TessellationOptions,
     fonts: &Fonts,
     clip_rect: Rect,
     command: PaintCmd,
@@ -774,7 +774,7 @@ fn tessellate_paint_command(
             text_style,
             color,
         } => {
-            tesselate_text(
+            tessellate_text(
                 options, fonts, clip_rect, pos, &galley, text_style, color, out,
             );
         }
@@ -782,8 +782,8 @@ fn tessellate_paint_command(
 }
 
 #[allow(clippy::too_many_arguments)]
-fn tesselate_text(
-    options: TesselationOptions,
+fn tessellate_text(
+    options: TessellationOptions,
     fonts: &Fonts,
     clip_rect: Rect,
     pos: Pos2,
@@ -850,15 +850,15 @@ fn tesselate_text(
 /// The given commands will be painted back-to-front (painters algorithm).
 /// They will be batched together by clip rectangle.
 ///
-/// * `commands`: the command to tesselate
-/// * `options`: tesselation quality
+/// * `commands`: the command to tessellate
+/// * `options`: tessellation quality
 /// * `fonts`: font source when tessellating text
 ///
 /// ## Returns
 /// A list of clip rectangles with matching [`Triangles`].
 pub fn tessellate_paint_commands(
     commands: Vec<(Rect, PaintCmd)>,
-    options: TesselationOptions,
+    options: TessellationOptions,
     fonts: &Fonts,
 ) -> Vec<(Rect, Triangles)> {
     let mut scratchpad_points = Vec::new();
@@ -915,7 +915,7 @@ pub fn tessellate_paint_commands(
     for (_, triangles) in &jobs {
         debug_assert!(
             triangles.is_valid(),
-            "Tesselator generated invalid Triangles"
+            "Tessellator generated invalid Triangles"
         );
     }
 
diff --git a/egui_glium/src/backend.rs b/egui_glium/src/backend.rs
index 7783eb86..c2cb9f7b 100644
--- a/egui_glium/src/backend.rs
+++ b/egui_glium/src/backend.rs
@@ -151,7 +151,7 @@ pub fn run(mut app: Box<dyn App>) -> ! {
             app.ui(&ctx, &mut integration_context);
             let app_output = integration_context.output;
             let (egui_output, paint_commands) = ctx.end_frame();
-            let paint_jobs = ctx.tesselate(paint_commands);
+            let paint_jobs = ctx.tessellate(paint_commands);
 
             let frame_time = (Instant::now() - frame_start).as_secs_f64() as f32;
             previous_frame_time = Some(frame_time);
diff --git a/egui_web/src/backend.rs b/egui_web/src/backend.rs
index c78bfa9e..977bc53d 100644
--- a/egui_web/src/backend.rs
+++ b/egui_web/src/backend.rs
@@ -42,7 +42,7 @@ impl WebBackend {
             .expect("unmatched calls to begin_frame/end_frame");
 
         let (output, paint_commands) = self.ctx.end_frame();
-        let paint_jobs = self.ctx.tesselate(paint_commands);
+        let paint_jobs = self.ctx.tessellate(paint_commands);
 
         let now = now_sec();
         self.previous_frame_time = Some((now - frame_start) as f32);