from The Century Dictionary.

  • noun In anatomy, a ball-and-socket joint; a kind of movable arthrosis or free articulation which consists in the socketing of a convex end of a bone in a concavity of another bone, forming a joint freely movable in every direction. The hip and shoulder are characteristic examples. Also enarthrodia.

from the GNU version of the Collaborative International Dictionary of English.

  • noun (Anat.) A ball and socket joint, or the kind of articulation represented by such a joint. See articulation.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • noun anatomy A ball-and-socket joint.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • noun a freely moving joint in which a sphere on the head of one bone fits into a rounded cavity in the other bone


from The American Heritage® Dictionary of the English Language, 4th Edition

[Greek enarthrōsis, from enarthros, jointed : en-, in; see en– + arthron, joint; see ar- in Indo-European roots.]



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