Emily Dickinson Lexicon
Definition for EN-AR-THRO'SIS
EN-AR-THRO'SIS, n. [Gr. εναρθρωσις; εν and αρθρον, a joint.]
In anatomy, a ball and socket joint; that species of articulation which consists in the insertion of the round end of a bone in the cup-like cavity of another, forming a joint movable in every direction. Quincy.
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