From German - English Ding/FreeDict dictionary ver. 1.9-fd1: Apt /ˈapt/ <neut, n, sg> [geol.] Aptian <n>, Aptian stage <n> Synonym: Aptium
Apt /ˈapt/ <neut, n, sg> [geol.] Aptian <n>, Aptian stage <n> Synonym: Aptium