halfbeak

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun Any of various slender, chiefly marine fishes of the family Hemiramphidae of warm waters, having a blue or green and silvery body and an elongated lower jaw that often has a bright red or orange tip.

from The Century Dictionary.

• noun 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.

from the GNU version of the Collaborative International Dictionary of English.

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

from Wiktionary, Creative Commons Attribution/Share-Alike License.

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

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun tropical and subtropical marine and freshwater fishes having an elongated body and long protruding lower jaw