halfbeak

American Heritage® Dictionary of the English Language, Fourth Edition

1. n. Any of various slender, bony, live-bearing tropical freshwater fishes of the family Hemiramphidae, characterized by a silvery appearance and an elongated lower jaw.

Century Dictionary and Cyclopedia

1. n. A fish of the family Exocœtidæ and genus Hemirhamphus, having the lower jaw developed into a long ensiform weapon, while the upper jaw is normally short; a hemirhamphine; a halfbill. Numerous species are found in tropical and subtropical seas.

Wiktionary

1. n. zoology Any slender, marine fish of the genus Hemirhamphus, having the upper jaw much shorter than the lower; -- called also balahoo.

GNU Webster's 1913

1. n. (Zoöl.) Any slender, marine fish of the genus Hemirhamphus, or of the family Hemiramphidae, having an elongated protruding lower jaw; -- called also balahoo.

WordNet 3.0

1. n. tropical and subtropical marine and freshwater fishes having an elongated body and long protruding lower jaw