Etymology
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torus (n.)

1560s, in architecture, "large, rounded molding at the base of a column," from Latin torus "a swelling, bulge, knot; cushion, couch."

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Definitions of torus

torus (n.)
a ring-shaped surface generated by rotating a circle around an axis that does not intersect the circle;
Synonyms: toroid
torus (n.)
commonly the lowest molding at the base of a column;
Synonyms: tore
From wordnet.princeton.edu