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

  • n. Anatomy See ball-and-socket joint.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. A ball-and-socket joint.

from the GNU version of the Collaborative International Dictionary of English

  • n. A ball and socket joint, or the kind of articulation represented by such a joint. See articulation.

from The Century Dictionary and Cyclopedia

  • n. 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 WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

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


Greek enarthr┼Źsis, from enarthros, jointed : en-, in; see en-2 + arthron, joint; see ar- in Indo-European roots.
(American Heritage® Dictionary of the English Language, Fourth Edition)



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