/ Dictionary / Index L labrum: Meaning and Definition of Find definitions for: la•brum Pronunciation: (lā'brum, lab'rum), [key] — pl. la•bra a lip or liplike part. the anterior, unpaired member of the mouthparts of an arthropod, projecting in front of the mouth. the outer margin of the aperture of a shell of a gastropod. a ring of cartilage about the edge of a joint surface of a bone. la•brum Pronunciation: (lā'brum), [key] — pl. -bra an ornamented bathtub of ancient Rome. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. labrid labrusca Related Content Daily Word Quiz: frugal Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language