Lewis & Short

1. gallus, i, m. [kindr. to Sanscr. grī, cry; Gr. γῆρυς, speech; Lat. garrio, garrulus; Engl. call], a cock, dunghill-cock, Varr. R. R. 2, 10, 4; 3, 9, 3; Cic. Div. 2, 26, 56 sq.; Juv. 13, 233; Hor. S. 1, 1, 10; Mart. 9, 69, 3; Plin. 10, 21, 25, § 50: ad cantum galli secundi, at second cock-crow, Juv. 9, 107; cf. Vulg. Marc. 14, 30; 68; 72.
Prov.: gallus in sterquilinio suo plurimum potest, i. e. every man is cock of his own dunghill, Sen. Apocol. 402.