/ Dictionary / Index B bipyramid: Meaning and Definition of Find definitions for: 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 Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. bipropellant biquadrate Related Content Daily Word Quiz: secular Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language