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lancetfish

[lan-sit-fish, lahn-] /ˈlæn sɪtˌfɪʃ, ˈlɑn-/
noun, plural (especially collectively) lancetfish (especially referring to two or more kinds or species) lancetfishes.
1.
any large, marine fish of the genus Alepisaurus, having daggerlike teeth.
Origin
1830-1840
1830-40; lancet + fish
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for lancet fish

lancet fish

noun
1.
either of two deep-sea teleost fishes, Alepisaurus ferox or A. borealis, having a long body with a long sail-like dorsal fin: family Alepisauridae
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Encyclopedia Article for lancet fish

either of two species of widely distributed, deepwater marine fish of the genus Alepisaurus (the family Alepisauridae). Lancet fish are elongated and slender, with a long, very tall dorsal fin and a large mouth that is equipped with formidable fanglike teeth. The fish grow to a large size, attaining a maximum length of about 1.8 m (6 feet). Voracious and carnivorous, they feed on a variety of fish and invertebrates. The longnose lancet fish (A. ferox) is found in the Atlantic Ocean; the Pacific lancet fish (A. richardsoni or A. borealis), in the Pacific

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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