/ Dictionary / Index L liquid propellant: Meaning and Definition of Find definitions for: liq'uid propel'lant Pronunciation: [key] a rocket propellant in liquid form. Cf. solid propellant. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. liquid petrolatum liquid protein Related Content Daily Word Quiz: arboreal Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language