AMPHIARTHROSIS, in Anatomy, a neutral or dubious kind of Articulation, distinguished from the Diarthrosis, in that it has no apparent Motion; and from the Synarthrosis, in its not being absolutely devoid of Motion. See ARTICULATION, DIARTHROSIS, etc. Such is the Articulation of the Ribs, with the Vertebrae; and that of the Carpus with the Tarsus, &c. See VERTEBRAE, CARPUS, etc. The Word, according to Dioscorides, is derived from amphi, both, and arthrosis, Articulation; the Amphiarthrosis being compounded of both the other sorts. Whence some also call it, Cyakebhais onate Prattal.
