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Definition of: labrum
(lā′brəm, lab′rəm) noun plural ·bra (-brə)
1. A lip (especially an outer lip) or a liplike part.
2. Entomol. A usually movable sclerite situated between the mandibles of an insect; the upper lip.
3. Zool. The outer lip of a univalve shell. [<L, a lip]
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