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adarticulation

adarticuˈlation Anat. Obs.
  [mod. f. L. ad to + articulatiōn-em jointing: see articulation.]
  A loose jointing of two bones; one which affords room for play; specially, the jointing of a bone into a shallow socket.

1753 Chambers Cycl. Supp., Adarticulation, in some physicians, is used for Arthrodia; in others for Diarthrosis. 1853 Mayne Exp. Lex., Adarticulation, a term in all respects synonymous with Arthrodia.

Oxford English Dictionary

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