n.
Pronunciation: ' to ̇ r- ə s
Function: noun
Inflected Form: plural to · ri \ ' to ̇ r- ˌ ī , - ˌ ē \
Etymology: New Latin, from Latin, protuberance, bulge, torus molding
Date: 1563
1 : a large molding of convex profile commonly occurring as the lowest molding in the base of a column
2 : the thickening of a membrane closing a wood-cell pit (as of gymnosperm tracheids) having the secondary cell wall arched over the pit cavity
3 : a doughnut-shaped surface generated by a circle rotated about an axis in its plane that does not intersect the circle broadly : TOROID
4 : a smooth rounded anatomical protuberance (as a bony ridge on the skull)