glenoid labrum
noun
variants:
or glenoidal labrum \ gli-ˈnȯid-ᵊl- 
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Medical Definition of glenoid labrum
: a fibrocartilaginous ligament forming the margin of the glenoid cavity of the shoulder joint that serves to broaden and deepen the cavity and gives attachment to the long head of the biceps brachii
— called also labrum