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torus

 - 5 dictionary results

to⋅rus

[tawr-uhs, tohr-]
–noun, plural to⋅ri [tawr-ahy, tohr-ahy] .
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.
a. a doughnut-shaped surface generated by the revolution of a conic, esp. a circle, about an exterior line lying in its plane.
b. the solid enclosed by such a surface.
3. Botany.
a. the receptacle of a flower.
b. 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.

Origin:
1555–65; < L: lit., strand, thong, raised ridge
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
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to·rus   (tôr'əs, tōr'-)   


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n.   pl. to·ri (tôr'ī, tōr'ī)
  1. Architecture A large convex molding, semicircular in cross section, located at the base of a classical column.

  2. Anatomy A bulging or rounded projection or swelling.

  3. Botany The receptacle of a flower.

  4. Mathematics A toroid generated by a circle; a surface having the shape of a doughnut. Also called tore2.


[Latin, bulge, knot, torus.]
The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2009 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Medical Dictionary

Main Entry: to·rus
Pronunciation: 'tOr-&s, 'tor-
Function: noun
Inflected Form: plural to·ri /'tO(&)r-"I, 'to(&)r-,-"E/
1 : a doughnut-shaped surface generated by a circle rotated about an axis in its plane that does not intersect the circle
2 : a smooth roundedanatomical protuberance (as a bony ridge on the skull) torus>
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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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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