ˈtōrəs noun
( plural to·ri -r(ˌ)ī, -r(ˌ)ē)
Etymology: New Latin, from Latin, protuberance, bulge, cushion, couch, torus molding
1. : a smooth rounded protuberance on a body part ; especially : any of several bony ridges that may be present on the skull
a supraocular torus
2. : a large architectural molding of convex profile commonly occurring as the lowest molding in the base of a column or pilaster and next above the plinth — compare ovolo ; see base illustration, molding illustration
3.
a. : receptacle 3b
b. : the thickening of the membrane closing a bordered pit
4. : a surface or solid shaped like a doughnut and formed by revolving a circle about a line in its plane without intersecting it : anchor ring
5. : a thickened vertical ridge bearing rows of uncini on the segments of many annelids
6. : the driving member of a fluid coupling