n. (pl. tori)
1. Archit. a large convex bun-shaped moulding esp. as the lowest part of the base of a column.
2 Bot. the receptacle of a flower.
3 Anat. a smooth ridge of bone or muscle.
4 Geom. a surface or solid formed by rotating a closed curve, esp. a circle, about a line in its plane but not intersecting it.
Etymology: L, swelling, bulge, cushion, etc.