the GNU version of the Collaborative International Dictionary of English
n. A hinge joint; an articulation, admitting of flexion and extension, or motion in two directions only, as the elbow and the ankle.
The Century Dictionary and Cyclopedia
n. In anatomy, a hinge-joint or ginglymoid articulation; a diarthrodial joint permitting movement in one plane only, the result being simple flexion and extension.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
n. a freely moving joint in which the bones are so articulated as to allow extensive movement in one plane
Word Usage
"The knee-joint was formerly described as a ginglymus or hinge-joint, but is really of a much more complicated character."