bill (subs.) Copy link Outline I. A beak (of a bird)1. rostrum2. cornu, n. (poet.)II. A mattock, battle-axe • bill (subs.): I. A beak (of a bird): 1. rostrum: v. beak. 2. cornu, n. (poet.): Ov. II. A mattock, battle-axe: q. v.: sĕcūris, is, f.