torus

A large convex molding, semicircular in cross section, located at the base of a classical column.

A bulging or rounded projection or swelling.

The receptacle of a flower.

A thickened area in the middle of the membrane that connects the pits of tracheids in conifers and certain other gymnosperms.

A toroid generated by a circle; a surface having the shape of a doughnut.

In geometry, a tore or anchor-ring. See tore, 2.

In architecture, a large convex molding of semicircular profile or a profile of kindred curve, used especially in bases, generally as the lowest member of the base, above the plinth when this is present. It differs from the astragal only in size, the astragal being much smaller. Sometimes called tore. See also cuts under base and column.

In botany, the receptacle of a flower; the more or less enlarged extremity of a stem or floral axis upon which the floral organs are situated. See receptacle, 2 , and cut under myrtle.

In anatomy, a smooth rounded ridge or elongated protuberance, as of a muscle; specifically, the tuber cinereum of the brain, or that part of the floor of the third ventricle which is prolonged downward to form a contracted passage from the cavity of the third ventricle into that of the pituitary body.