binormal (binormal)

[ binotate, binotated (binō'tāt, -ta-ted), a. [L. bi-, two, + nota, mark, + -ate1, -ated.] In zoöl., marked with two dots. binotonous (bi-not'ō-nus), [ a. a binotonous sound. Binormal.The full lines show a cylinder with a helix drawn upon it and two bi normals. The dotted lines show the tangents and prin cipal normals the same two points of the helix and the axis of the cylinder.