[ tawr-oid, tohr- ]
/ ˈtɔr ɔɪd, ˈtoʊr- /

noun Geometry.

a surface generated by the revolution of any closed plane curve or contour about an axis lying in its plane.
the solid enclosed by such a surface.

Nearby words

  1. torngat mountains,
  2. tornillo,
  3. tornio,
  4. tornwaldt's abscess,
  5. toro,
  6. toroidal,
  7. toronto,
  8. toronto blessing,
  9. torontonian,
  10. torose

Origin of toroid

First recorded in 1895–1900; tor(us) + -oid Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

British Dictionary definitions for toroid


/ (ˈtɔːrɔɪd) /


geometry a surface generated by rotating a closed plane curve about a coplanar line that does not intersect the curve
the solid enclosed by such a surfaceSee also torus
Derived Formstoroidal, adjective

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

Science definitions for toroid


[ tôroid′ ]

A surface generated by rotating a closed curve about an axis that is in the same plane as the curve but does not intersect it.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.