Torus
Part of speech: noun
Definition: A three-dimensional shape consisting of a ring with a circular cross-section. The shape of an inner tube or hollow doughnut. A molding which projects at the base of a column and above the plinth. A botanical term for the end of the peduncle or flower stalk to which the floral parts (or in the Asteraceae, the florets of a flower head) are attached; see receptacle
Toroid
Part of speech: noun
Definition: A surface generated by a closed curve (especially a circle) rotating about, but not intersecting or containing, an axis in its own planeA ring-shaped object whose surface is a torus