/ Dictionary / Index B bipropellant: Meaning and Definition of Find definitions for: bi•pro•pel•lant Pronunciation: (bī"pru-pel'unt), [key] — n. Rocketry. a missile or rocket propellant, composed of fuel and oxidizer, the components of which are kept in separate compartments prior to combustion. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. biprism bipyramid 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