• (a.) Pertaining to an acroterium; as, acroterial ornaments.
Ac`ro·te'ri·al (ăk`ro*tē'rĭ* a l) adjective Pertaining to an acroterium; as, acroterial ornaments. P. Cyc. 
acroter, acroterial, acroterion, acroterium 1. The pinnacles or other ornaments standing in ranges on the horizontal coping or parapets of a building. 2. On classical buildings, one of the angles of a pediment; also, a statue or other ornament placed at one of these; especially, at the apex.