Gin·gly·mus n.; pl. Ginglymi   Anat. A hinge joint; an articulation, admitting of flexion and extension, or motion in two directions only, as the elbow and the ankle.
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  ginglymus
       n : a freely moving joint in which the bones are so articulated
           as to allow extensive movement in one plane [syn: hinge
           joint, ginglymoid joint]
       [also: ginglymi (pl)]