Ellipsoid
el·lip·soid
 Audio Help (ĭ-lĭp'soid') Pronunciation Key
n.
A geometric surface, all of whose plane sections are either ellipses or circles.
el·lip'soid', el·lip'soi'dal (ĭ-lĭp'soid'l, ěl'ĭp-, ē'lĭp-) adj.
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The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2000 by Houghton Mifflin Company.
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