Definition of labrum
1
: an upper or anterior mouthpart of an arthropod consisting of a single median piece in front of or above the mandibles
2
: a ring of fibrous cartilage forming the margin of the shallow cavity of the upper part of the scapula by which the humerus articulates with the shoulder girdle
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Merriam-Webster unabridged
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Time Traveler for labrum
The first known use of labrum was in 1578
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