[tawr-uhs, tohr-]
noun, plural tori [tawr-ahy, tohr-ahy] .
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. See illus. under molding and column.
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.
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.
Anatomy. a rounded ridge; a protuberant part.

1555–65; < Latin: literally, strand, thong, raised ridge Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
torus (ˈtɔːrəs)
n , pl -ri
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: 4π²Rr; volume: 2π²Rr², 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
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
[C16: from Latin: a swelling, of obscure origin]

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Medical Dictionary

torus to·rus (tôr'əs)
n. pl. to·ri (tôr'ī)
A bulging or rounded projection or swelling, such as is caused by a bone or muscle.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
torus   (tôr'əs)  Pronunciation Key 
Plural tori (tôr'ī)
  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.

The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
Depicted as a geometric shape, this pattern conforms to a donut-shaped figure
  known as a torus.
In the dark matter torus also the visible matter is located.
There is torus for which are characteristic two circles.
The torus, a sphere with a hole in the middle, is a different form.
Image for Torus
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