/ Dictionary / Index L lustral: Meaning and Definition of Find definitions for: lus•tral Pronunciation: (lus'trul), [key] — adj. of, pertaining to, or employed in the lustrum, or rite of purification. occurring every five years; quinquennial. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. lustihood lustrate 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