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torus

[ tawr-uhs ]
/ ˈtɔr əs /
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noun, plural to·ri [tawr-ahy]. /ˈtɔr aɪ/.
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.
Geometry.
  1. Rarely an·chor ring . 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.
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.
Anatomy. a rounded ridge; a protuberant part.
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Origin of torus

First recorded in 1555–65; from Latin: literally, “strand, thong, raised ridge”
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2022

How to use torus in a sentence

British Dictionary definitions for torus

torus
/ (ˈtɔːrəs) /

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

Word Origin for torus

C16: from Latin: a swelling, of obscure origin
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Scientific definitions for torus

torus
[ tôrəs ]

Plural tori (tôrī)
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.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
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