Acromial :: Acromial (a.) Of or pertaining to the acromion.
Acromion :: Acromion (n.) The outer extremity of the shoulder blade.
Metacromion :: Metacromion (n.) A process projecting backward and downward from the acromion of the scapula of some mammals.
Supra-acromial :: Supra (adv.) Over; above; before; also, beyond; besides; -- much used as a prefix..