Definitions
from The American Heritage® Dictionary of the English Language, 5th Edition.
- noun Either of two large, elongated marine fishes (Alepisaurus ferox or A. brevirostris) having long sharp teeth, a large dorsal fin, and no scales.
from the GNU version of the Collaborative International Dictionary of English.
- noun (Zoöl.)  A large, elongated, scaleless, voracious, deep-sea fish (Alepidosaurus ferox ), having long, sharp, lancetlike teeth and a long saillike dorsal fin.
- noun The doctor, or surgeon fish.
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- noun   A voracious deep-sea fish in the genus Alepisaurus, having long,lancet -like teeth.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- noun large elongate scaleless oceanic fishes with sharp teeth and a long dorsal fin that resembles a sail
Etymologies
from Wiktionary, Creative Commons Attribution/Share-Alike License
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Examples
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								All kinds of weird species (like the lancetfish shown) wash up on Oregon's beaches. Archive 2008-01-01 2008 
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								Speaking of terrifying, a longnose lancetfish recently washed ashore in the state of Washington. Type D D! typed 2008 
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								DSL species rise at night-some to waters as shallow as 30 feet deep-for a variety of reasons: Some are avoiding the daytime surface hunters; others are avoiding the nocturnal hunters of the DSL who don't rise (like lancetfish); still others are saving energy by spending their days in a sleeplike state prompted by the frigid waters. MotherJones.com 2010 
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								DSL species rise at night-some to waters as shallow as 30 feet deep-for a variety of reasons: Some are avoiding the daytime surface hunters; others are avoiding the nocturnal hunters of the DSL who don't rise (like lancetfish); still others are saving energy by spending their days in a sleeplike state prompted by the frigid waters. 
chained_bear commented on the word lancetfish
"On September 4 we set out 400 hooks and the catch consisted of twelve swordfish, one mako shark, three lancetfish, three skates, one blue shark and a leatherback turtle, which was released alive."
—Joseph Pelczarski, Mass. Coastal Zone Mgmt. Program, 1982, quoted in Sebastian Junger, The Perfect Storm, 1997 (NY: HarperCollins, 1999), 58
August 19, 2009