Architecture. a large convex molding, more or less semicircular in profile, commonly forming the lowest molding of the base of a column, directly above the plinth, sometimes occurring as one of a pair separated by a scotia and fillets. and column.

Geometry.

a doughnut-shaped surface generated by the revolution of a conic, especially a circle, about an exterior line lying in its plane.

the solid enclosed by such a surface.

Botany.

the receptacle of a flower.

a thickening of the wall membrane in the bordered pits occurring in the tracheid cells of the wood of many conifers.

Also called: torea large convex moulding approximately semicircular in cross section, esp one used on the base of a classical column

geometrya ring-shaped surface generated by rotating a circle about a coplanar line that does not intersect the circle. Area: 4π² Rr; volume: 2π² Rr ², where r is the radius of the circle and R is the distance from the line to the centre of the circle

A surface generated by rotating a circle about an axis that is in the same plane as the circle but does not intersect it. A torus resembles a donut and is a subtype of toroid.

The torus-shaped apparatus that contains plasma in nuclear fusion reactors.