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n. pl. lancetfish or lan·cet·fish·es
Either of two large, elongated marine fishes (Alepisaurus ferox or A. brevirostris) having long sharp teeth, a large dorsal fin, and no scales.
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Noun1.lancetfish - large elongate scaleless oceanic fishes with sharp teeth and a long dorsal fin that resembles a sail
malacopterygian, soft-finned fish - any fish of the superorder Malacopterygii
Alepisaurus, genus Alepisaurus - slender scaleless predaceous tropical deep-sea fishes