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From The Collaborative International Dictionary of English v.0.48:
Glenoid \Gle"noid\, a. [Gr. ?; ? socket of a joint + e'i^dos form; cf. F. gl['e]no["i]de.] (Anat.) Having the form of a smooth and shallow depression; socketlike; -- applied to several articular surfaces of bone; as, the glenoid cavity, or fossa, of the scapula, in which the head of the humerus articulates. [1913 Webster]