1. (noun) swordfish, Xiphias gladius - a large fish up to 4.45 m long weighing up to 540 kg. Snout has long, broad, sword-like bill. Eyes and mouth are large and fins rigid. Dark brown or grey to blue-black or purple-black above and whitish with silvery sheen below and dark fins. Found throughout the world in tropical to temporate seas. Eats smaller fish and squid.