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Webster 1913 Edition

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Noun.

[NL., fr. Gr. [GREEK], fr. [GREEK] well articulated;

ἄρθρον

a joint + [GREEK] shape.]

(Anat.)

A form of diarthrodial articulation in which the articular surfaces are nearly flat, so that they form only an imperfect ball and socket.

Noun.

[Gr. from to frame or articulate.]

A species of articulation, in which the head of one bone is received into the shallow socket of another; as the humerus and the scapula.

In natural history, a genus of imperfect crystals, found in complex masses, and forming long single pyramids, with very short and slender columns.

arthrodia ‎(plural arthrodias)

(anatomy) A form of diarthrodial articulation in which the articular surfaces are nearly flat, so that they form only an imperfect ball and socket joint.
- 1813, John Mason Good, Olinthus Gilbert Gregory, Pantologia
  The radius is connected […] to the carpus by arthrodia.

articulation in which the surfaces are nearly flat