swordfish

American Heritage® Dictionary of the English Language, Fourth Edition

1. n. A large marine food and game fish (Xiphias gladius) having a long swordlike extension of the upper jaw that is used chiefly as a means of defense and attack.

Century Dictionary and Cyclopedia

1. n. A common name of various fishes. Originally, Xiphias gladius, the common sword fish of the Atlantic and Mediterranean, having the upper jaw elongated into a sharp sword-like weapon (whence the name); hence, any xiphioid fish; any member of the Xiphiidæ. The common sword fish resembles and is related to the sailfish and spearfish (compare cuts under these words). It measures from 10 to 15 feet in length, the sword forming about three tenths of this length, and acquires a weight of from 300 to 400 pounds; it has a single long elevated dorsal fin, but no ventral fins. The sword-fish attacks other fishes with its jaw, and it sometimes perforates the planks of ships with the same powerful weapon. The fiesh is very palatable and nutritious.
2. n. [capitalized] In astronomy, a southern constellation, Dorado.

Wiktionary

1. n. A large marine fish with a long, pointed bill, Xiphias gladius.
2. v. To fish for swordfish.

GNU Webster's 1913

1. n. A very large oceanic fish (Xiphias gladius), the only representative of the family Xiphiidæ. It is highly valued as a food fish. The bones of the upper jaw are consolidated, and form a long, rigid, swordlike beak; the dorsal fin is high and without distinct spines; the ventral fins are absent. The adult is destitute of teeth. It becomes sixteen feet or more long.
2. n. The gar pike.
3. n. The cutlass fish.
4. n. (Astron.) A southern constellation. See Dorado, 1.

WordNet 3.0

1. n. large toothless marine food fish with a long swordlike upper jaw; not completely cold-blooded i.e. they are able to warm their brains and eyes: worldwide in warm waters but feed on cold ocean floor coming to surface at night
2. n. flesh of swordfish usually served as steaks