Lewis Short
(adjective) : amnĭcus, a, um, id.
* Of or pertaining to a river (only post-class.): calami,Plin. 16, 36, 66, § 166: insula Metubarris amnicarum maxima,i. e. of those formed by rivers,id. 3, 25, 28, § 148: calami,id. 16, 36, 66, § 166: pisces,Sol. 37: terga,Aus. Mos. 205.
Charlton T. Lewis, Charles Short, A Latin Dictionary