Lewis Short
(adjective) : Prŏpontis (Prōpontis, Manil. 4, 676), ĭdos and ĭdis, f., = Προποντίς
* The Propontis or Sea of Marmora, between the Hellespont and the Thracian Bosporus, Mel. 1, 1, 5; 1, 3, 1; Plin. 4, 12, 24, § 76; Liv. 38, 16; Tac. A. 2, 54; Flor. 3, 6; Cat. 4, 9; Ov. P. 4, 9, 118.—Hence
* Prŏpontĭăcus, a, um, , of or belonging to the Propontis: aqua,Prop. 3 (4), 21, 1. orae,Ov. Tr. 1, 10, 29.
Charlton T. Lewis, Charles Short, A Latin Dictionary