Толковый словарь английского языка - torus

noun (plural tori) Etymology: New Latin, from Latin, protuberance, bulge, ~ molding Date: 1563 a large molding of convex profile commonly occurring as the lowest molding in the base of a column, the thickening of a membrane closing a wood-cell pit (as of gymnosperm tracheids) having the secondary cell wall arched over the pit cavity, a doughnut-shaped surface generated by a circle rotated about an axis in its plane that does not intersect the circle, a smooth rounded anatomical protuberance (as a bony ridge on the skull)