torus
to·ruspl. -·ri·
- Anat. any rounded projection or swelling
- Archit. a large, convex molding used at the base of columns, etc., just above the plinth
- Bot.
- receptacle (sense )
- a thick spot at the center of the pit membrane in bordered pits of xylem cells
- Geom. a surface, or its enclosed solid, generated by the revolution of a conic about any line that is external to the conic but in the same plane, as a doughnut-shaped figure that is generated by a circle or an ellipse
Origin of torus
L, a bulge, muscletorus
noun
pl. to·ri- 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 a. The receptacle of a flower.b. A thickened area in the middle of the membrane that connects the pits of tracheids in conifers and certain other gymnosperms.
- Mathematics A toroid generated by a circle; a surface having the shape of a doughnut. Also called tore^{2}.
Origin of torus
Latin, bulge, knot, torus.torus
torus
Noun
(plural tori or toruses)
- (topology) A topological space which is a product of two circles.
- A 4-variable Karnaugh map can be thought of, topologically, as being a torus.
- (mathematics) The standard representation of such a space in 3-dimensional Euclidean space: a shape consisting of a ring with a circular cross-section: the shape of an inner tube or hollow doughnut.
- (topology, in combination, n-torus, 4-torus, etc.) The product of the specified number of circles.
- (architecture) A molding which projects at the base of a column and above the plinth.
- (botany) The end of the peduncle or flower stalk to which the floral parts (in the Asteraceae, the florets of a flower head) are attached; see receptacle.
Origin
From Latin torus (“swelling, protuberance").