"A bony process forming the lateral or distal end of the spine of the scapula, with which (in humans and certain other mammals) the clavicle articulates", Late 16th cent.; earliest use found in John Banister (1532/3–?1610), surgeon. From post-classical Latin acromion and its etymon ancient Greek ἀκρώμιον (Hippocrates) from ἄκρο- + ὦμος shoulder + -ιον, suffix forming nouns.[acromion etymology, acromion origin, 英语词源]