Definitions
1.nounThe surface described by the circumference of a circle revolving about a straight line in its own plane.
2.nounThe solid enclosed by such a surface; an anchor ring.
3.nounA topological space which is a product of two circles."A 4-variable Karnaugh map can be thought of, topologically, as being a torus."
4.nounThe 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.
5.noun(in combination, n-torus, 4-torus, etc.) The product of the specified number of circles.
6.nounA molding which projects at the base of a column and above the plinth.
7.nounThe end of the peduncle or flower stalk to which the floral parts (or in the Asteraceae, the florets of a flower head) are attached; receptacle, thalamus.
8.nounA rounded ridge, especially one on the occipital bone.