noun, plural to·ri [tawr-ahy, tohr-ahy] /ˈtɔr aɪ, ˈtoʊr aɪ/.

  1. 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.
  2. Geometry.
    1. a doughnut-shaped surface generated by the revolution of a conic, especially a circle, about an exterior line lying in its plane.
    2. the solid enclosed by such a surface.
  3. Botany.
    1. the receptacle of a flower.
    2. a thickening of the wall membrane in the bordered pits occurring in the tracheid cells of the wood of many conifers.
  4. Anatomy. a rounded ridge; a protuberant part.

noun plural -ri (-raɪ)

  1. Also called: tore a large convex moulding approximately semicircular in cross section, esp one used on the base of a classical column
  2. geometry a 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
  3. botany another name for receptacle (def. 2)
  4. anatomy a ridge, fold, or similar linear elevation
  5. astronomy a dense ring of gas and dust which surrounds a dying star, containing most of the star’s ejected gas

1560s, from Latin torus “a swelling, bulge, knot; cushion, couch.”

n. pl. to•ri (tôrī)

  1. A bulging or rounded projection or swelling, such as is caused by a bone or muscle.

Plural tori (tôrī)

  1. 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.
  2. The torus-shaped apparatus that contains plasma in nuclear fusion reactors.
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