Definition from Wiktionary, the free dictionary
See also Torus
From Latin torus (“swelling, protuberance”).
- (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 (or in the Asteraceae, the florets of a flower head) are attached; see receptacle.
Derived terms 
shape in 3-dimensional Euclidean space
in combination, product of circles
end of a stalk
See also 
inflected form of torua
Alternative forms 
- a swelling, protuberance, bulge, knot
- the muscular part of an animal
- raised ornament on a garland
- bolster, cushion
- (by extension) bed, couch
- embankment, an elevation of earth
- (architecture) large round molding at the base of a column
Derived terms 
- torus in Charlton T. Lewis & Charles Short, A Latin Dictionary, Oxford: Clarendon Press, 1879
- (topology) torus; a shape consisting of a ring, or an object of the same topology residing in a space of higher dimension; especially considered as a Cartesian product of two circles in a four-dimensional space
Declension of torus