Hypertext Webster Gateway: "labrum"
From Webster's Revised Unabridged Dictionary (1913) (web1913)
Labrum \La"brum\, n.; pl. L. {Labra}, E. {Labrums}. [L.]
1. A lip or edge, as of a basin.
2. (Zo["o]l.)
(a) An organ in insects and crustaceans covering the upper
part of the mouth, and serving as an upper lip. See
Illust. of {Hymenoptera}.
(b) The external margin of the aperture of a shell. See
{Univalve}.
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