English

interarticular

From inter- + articular.

Proto-Indo-European *h₁én ‘in’

Proto-Indo-European *h₁entér ‘between’

Proto-Italic *n̥ter ‘between’

Latin inter ‘between’

Proto-Indo-European *h₂r-tú-s

…

Latin artus ‘a joint’

Latin articulus ‘joint’

Latin articulō ‘to divide into single members or joints’

Latin articularis

Today it means

adj Between the surfaces of a joint

Language periods are conventional ranges, not dates for this word.

Etymograph / interarticular