La"brum (?), n.; pl. L. Labra (#), E. Labrums (#). [L.]
A lip or edge, as of a basin.
2. Zool. (a)
An organ in insects and crustaceans covering the upper part of the mouth, and serving as an upper lip. See Illust. of Hymenoptera.
The external margin of the aperture of a shell. See Univalve.
© Webster 1913.