amnĭcus

I. of or pertaining to a river (only post-class.): calami, Plin. 16, 36, 66, § 166: insula Metubarris amnicarum maxima, id. 3, 25, 28, § 148: calami, id. 16, 36, 66, § 166: pisces, Sol. 37: terga, Aus. Mos. 205.