Articulation (of bones), specifically by a joint which permits movement; an instance of this; a joint of this kind. Compare earlier "diarthrosis", "enarthrosis", "synarthrosis".

Disease of the joints; (in later use) specifically degenerative or other non-inflammatory disease; an instance of this. Compare earlier "arthrosia", and later "haemarthrosis", "hydrarthrosis", osteoarthrosis.