different between arthrodia vs arthrodial

English

From Ancient Greek ???????? (arthr?día), from ???????? (arthr?d?s, “well articulated”)

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.

arthrodia +? -al

arthrodial (not comparable)

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