The story
From Latin ab- (“from”) + Ancient Greek ἄρθρον (árthron, “joint”) + -osis (“condition”).
Etymology from Wiktionary, CC BY-SA 4.0.
abarthrosis
Today it means: A form of articulation that allows considerable change in position and spatial relationship between the articulated parts, and which bones move freely upon one another; diarthrosis. Full definition →