Torus
/ˈtɔːrəs/noun
A ring-shaped surface or a rounded projecting molding in architecture.
Did you know?Latin torus could mean a swelling, bulge, or cushion-like ridge, and in classical usage it was also used for a couch or bed, showing how one root moved from physical lump to elegant form.
Etymological Timeline
Proto-Indo-European
PIE
*ter-
“to twist, turn, or bore”
Latin
Latin
torus
“a swelling, bulge, cushion, or rounded ridge; also a couch or bed”
Late Latin
Latin
torus
“a rounded molding or projecting band”
16th Century
English
torus
“a convex molding in architecture”
19th Century
English
torus
“a ring-shaped geometric surface”