badius
From LSJ
bădĭus: a, um, adj.,
I brown, chestnutcolored (rare; only of horses), Varr. ap. Non. p. 80, 2; Pal. Mart. 13, 4; Grat. Cyn. 536.
bădĭus, a, um, bai : Varro Men. 358 ; Isid. Orig. 12, 1, 48 ; Pall. 4, 13, 3 || couleur d’hirondelle : Gloss.