toroid

[tawr-oid, tohr-]

to·roid

[tawr-oid, tohr-]
noun Geometry.
1.
a surface generated by the revolution of any closed plane curve or contour about an axis lying in its plane.
2.
the solid enclosed by such a surface.

Origin:
1895–1900; tor(us) + -oid
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Toroid is always a great word to know.
So is ninnyhammer. Does it mean:
a stew of meat, vegetables, potatoes, etc.
a fool or simpleton; ninny.
Collins
World English Dictionary
toroid (ˈtɔːrɔɪd)
 
n
1.  geometry a surface generated by rotating a closed plane curve about a coplanar line that does not intersect the curve
2.  See also torus the solid enclosed by such a surface
 
to'roidal
 
adj

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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American Heritage
Science Dictionary
toroid   (tôr'oid')  Pronunciation Key 
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 © 2002. Published by Houghton Mifflin. All rights reserved.
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