Cut"lass (kŭt"las), n.; pl. Cutlasses (- &ebreve;z). [F. coutelas (cf. It. coltellaccio), augm. fr. L. cultellus a small knife, dim. of culter knife. See Colter, and cf. Curtal ax.] A short, heavy, curving sword, used in the navy. See Curtal ax.

Cutlass fish, (Zoöl.), a peculiar, long, thin, marine fish (Trichiurus lepturus) of the southern United States and West Indies; -- called also saber fish, silver eel, and, improperly, swordfish.