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Dictionary

bi•pyr•a•mid

Pronunciation: (bī-pir'u-mid), [key]
—n. Crystall.
a form symmetrical about a plane dividing it into two pyramids. Also called dipyramid.

Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.

bipropellant

biquadrate

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