Labrum definitions

lā'brəm
A lip or liplike structure, such as the one forming the roof of the mouth in insects.
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The outer margin of the opening of a gastropod shell.
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A lip or liplike edge; esp., the upper or front lip of insects and other arthropods.
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A lip or liplike structure, such as the one forming the roof of the mouth in insects.
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The uppermost of the mouthparts (trophi) of a typical insect, such as a cockroach. Typically resembles an upper lip and forms part of the roof of the mouth in such insects.
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(anatomy) Any of several lip-like projections.
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A large basin of warm water, with an overhanging lip, in a Roman bath.
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Origin of labrum

Latin lip leb- in Indo-European roots