fluvialis
From LSJ
οἵτινες πόλιν μίαν λαβόντες εὐρυπρωκτότεροι πολύ τῆς πόλεος ἀπεχώρησαν ἧς εἷλον τότε → after taking a single city they returned home, with arses much wider than the city they captured
Latin > English (Lewis & Short)
flŭvĭālis: e, adj. fluvius,
I of or belonging to a river, river-, fluvial: undae, Verg. A. 9, 70; Ov. M. 1, 82: aqua, Col. 6, 22 fin.: harundo, Verg. G. 2, 414: harena, Pall. Oct. 17 fin.: lupus, a fish, Col. 8, 16, 4; v. lupus.
Latin > French (Gaffiot 2016)
flŭvĭālis,¹⁴ e (fluvius), de fleuve, fluvial : Virg. En. 9, 70 || flŭvĭātĭcus, a, um Col. Rust. 8, 15, 5 || flŭvĭātĭlis, e, Cic. Nat. 2, 124 ; Liv. 10, 2, 12.