torus

to·rus Audio Help (tôr'əs, tōr'-)

n. pl. to·ri (tôr'ī, tōr'ī)

Architecture A large convex molding, semicircular in cross section, located at the base of a classical column.
Anatomy A bulging or rounded projection or swelling.
Botany The receptacle of a flower.
Mathematics A toroid generated by a circle; a surface having the shape of a doughnut. Also called tore².

[Latin, bulge, knot, torus.]

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The American Heritage® Dictionary of the English Language, Fourth Edition
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