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tro·choid / ˈtrōˌkoid/ • adj. 1. Anat. denoting a joint in which one element rotates on its own axis (e.g., the atlas vertebra). 2. Geom. 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. Zool. having or denoting a form of mollusk shell that is conical with a flat base, like a top shell. • n. 1. a trochoid curve. 2. a trochoid joint. DERIVATIVES: tro·choi·dal / trōˈkoidl/ adj.

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