Learn how to say Trochoidal correctly in English with this tutorial pronunciation video.
Oxford dictionary definition of the word trochoid:
1 Anatomy denoting a joint in which one element rotates on its own axis (e.g. the atlas vertebra).
2 Geometry denoting a curve traced by a point on a radius of a circle rotating along a straight line or another circle (a cycloid, epicycloid, or hypocycloid).
3 Zoology having or denoting a form of mollusc shell which is conical with a flat base, like a top shell.
1a trochoid curve.
2a trochoid joint.
early 18th century: from Greek trokhoeidēs ‘wheel-like’, from trokhos ‘wheel’