diff --git a/modules/brep/io/brepIO.ts b/modules/brep/io/brepIO.ts
index 2fd0f8f6..535908f6 100644
--- a/modules/brep/io/brepIO.ts
+++ b/modules/brep/io/brepIO.ts
@@ -20,9 +20,9 @@ export function readBrep(data: BREPData) {
     bb.face();
     let nonDirect = faceData.surface.direct === false; // left handed coordinate system for planes
     let inverted = faceData.inverted !== nonDirect;
-    bb._face.data.tesselation = {
+    bb._face.data.tessellation = {
       format: 'verbose',
-      data: normalizeTesselationData(faceData.tess, inverted, faceData.surface.TYPE === 'PLANE' ? faceData.surface.normal : undefined)
+      data: normalizetessellationData(faceData.tess, inverted, faceData.surface.TYPE === 'PLANE' ? faceData.surface.normal : undefined)
     };
     bb._face.data.productionInfo = faceData.productionInfo;
     if (faceData.ref !== undefined) {
@@ -37,7 +37,7 @@ export function readBrep(data: BREPData) {
         let a = vf.getData(edgeData.inverted ? edgeData.b : edgeData.a);
         let b = vf.getData(edgeData.inverted ? edgeData.a : edgeData.b);
         bb.edge(a, b, () => readCurve(edgeData.curve), edgeData.inverted,  edgeData.edgeRef);
-        bb.lastHalfEdge.edge.data.tesselation = edgeData.tess;
+        bb.lastHalfEdge.edge.data.tessellation = edgeData.tess;
         //todo: data should provide full externals object
         bb.lastHalfEdge.edge.data.externals = {
           ptr: edgeData.ptr
@@ -73,7 +73,7 @@ function readSurface(s, inverted, face) {
 
     let tr = plane.get2DTransformation();
     for (let he of face.outerLoop.halfEdges) {
-      let tess = he.edge.data.tesselation ? he.edge.data.tesselation : he.edge.curve.tessellateToData();
+      let tess = he.edge.data.tessellation ? he.edge.data.tessellation : he.edge.curve.tessellateToData();
       tess.forEach(p => bBox.checkData(tr.apply3(p)));
     }
     bBox.expand(10);
@@ -96,7 +96,7 @@ function readCurve(curve) {
   }
 }
 
-export function normalizeTesselationData(tessellation, inverted, surfaceNormal) {
+export function normalizetessellationData(tessellation, inverted, surfaceNormal) {
   let tess = [];
   for (let i = 0; i < tessellation.length; ++i) {
     let [tr, normales] = tessellation[i];
diff --git a/modules/brep/topo/face.ts b/modules/brep/topo/face.ts
index 4c15919b..bae8bd46 100644
--- a/modules/brep/topo/face.ts
+++ b/modules/brep/topo/face.ts
@@ -14,7 +14,7 @@ declare module './face' {
     data: {
       id: string,
       productionInfo: ProductionInfo,
-      tesselation: {
+      tessellation: {
         format: string,
         data: any;
       }
diff --git a/modules/scene/objects/scalableLine.js b/modules/scene/objects/scalableLine.js
index 3fa58b99..cffef86a 100644
--- a/modules/scene/objects/scalableLine.js
+++ b/modules/scene/objects/scalableLine.js
@@ -10,8 +10,8 @@ import {ORIGIN} from "math/vector";
 
 export default class ScalableLine extends Mesh {
 
-  constructor(tesselation, width, color, opacity, smooth, ambient) {
-    super(createGeometry(tesselation, smooth), createMaterial(color, opacity, ambient));
+  constructor(tessellation, width, color, opacity, smooth, ambient) {
+    super(createGeometry(tessellation, smooth), createMaterial(color, opacity, ambient));
     this.width = width;
     this.morphTargetInfluences = [0];
   }
diff --git a/web/app/cad/scene/views/edgeView.js b/web/app/cad/scene/views/edgeView.js
index e0c21e74..6df56d1f 100644
--- a/web/app/cad/scene/views/edgeView.js
+++ b/web/app/cad/scene/views/edgeView.js
@@ -4,7 +4,7 @@ export class EdgeView extends CurveBasedView {
   
   constructor(edge) {
     let brepEdge = edge.brepEdge;
-    let tess = brepEdge.data.tesselation ? brepEdge.data.tesselation : brepEdge.curve.tessellateToData();
+    let tess = brepEdge.data.tessellation ? brepEdge.data.tessellation : brepEdge.curve.tessellateToData();
     super(edge, tess, 2, 3, 0x2B3856, 0xd1726c);
   }
 }
diff --git a/web/app/cad/scene/views/faceView.js b/web/app/cad/scene/views/faceView.js
index a5d17ac8..834bab4a 100644
--- a/web/app/cad/scene/views/faceView.js
+++ b/web/app/cad/scene/views/faceView.js
@@ -56,8 +56,8 @@ export class FaceView extends SketchingView {
     this.geometry = geometry;
     this.meshFaces = [];
     let off = geometry.faces.length;
-    if (face.brepFace.data.tesselation) {
-      tessDataToGeom(face.brepFace.data.tesselation.data, geometry)
+    if (face.brepFace.data.tessellation) {
+      tessDataToGeom(face.brepFace.data.tessellation.data, geometry)
     } else {
       brepFaceToGeom(face, geometry);
     }
diff --git a/web/app/cad/scene/wrappers/brepSceneObject.js b/web/app/cad/scene/wrappers/brepSceneObject.js
index 1021a5d9..2b472856 100644
--- a/web/app/cad/scene/wrappers/brepSceneObject.js
+++ b/web/app/cad/scene/wrappers/brepSceneObject.js
@@ -33,8 +33,8 @@ export class BREPSceneSolid extends SceneSolid {
       const sceneFace = new BREPSceneFace(brepFace, this);
       this.sceneFaces.push(sceneFace);
       let off = geom.faces.length;
-      if (brepFace.data.tesselation) {
-        tessDataToGeom(brepFace.data.tesselation.data, geom)
+      if (brepFace.data.tessellation) {
+        tessDataToGeom(brepFace.data.tessellation.data, geom)
       } else {
         brepFaceToGeom(brepFace, geom);
       }
@@ -67,7 +67,7 @@ export class BREPSceneSolid extends SceneSolid {
         materialParams.transparent = true;
         materialParams.opacity = opacity;
       }
-      let tess = edge.data.tesselation ? edge.data.tesselation : edge.curve.tessellateToData();
+      let tess = edge.data.tessellation ? edge.data.tessellation : edge.curve.tessellateToData();
       let base = null;
       for (let i = 1; i < tess.length; i++) {
 
diff --git a/web/app/cad/tess/brep-tess.js b/web/app/cad/tess/brep-tess.js
index bfd92133..75cbc246 100644
--- a/web/app/cad/tess/brep-tess.js
+++ b/web/app/cad/tess/brep-tess.js
@@ -124,6 +124,6 @@ function begincallback(type) {
   }
 }
 function errorcallback(errno) {
-  console.log('tesselation error');
+  console.log('tessellation error');
   console.log('error number: ' + errno);
 }
diff --git a/web/app/cad/tess/triangulation.js b/web/app/cad/tess/triangulation.js
index 0a50b3d3..b0833b46 100644
--- a/web/app/cad/tess/triangulation.js
+++ b/web/app/cad/tess/triangulation.js
@@ -43,8 +43,8 @@ function errorcallback(errno) {
 
 export function Triangulate(contours, normal) {
   const tessy = initTesselator();
-  // libtess will take 3d verts and flatten to a plane for tesselation
-  // since only doing 2d tesselation here, provide z=1 normal to skip
+  // libtess will take 3d verts and flatten to a plane for tessellation
+  // since only doing 2d tessellation here, provide z=1 normal to skip
   // iterating over verts only to get the same answer.
   // comment out to test normal-generation code
   //tessy.gluTessNormal(0, 0, 1);