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jackknife-fish

[jak-nahyf-fish]
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noun, plural jack·knife-fish·es, (especially collectively) jack·knife-fish. Ichthyology.
  1. a black and white, American drum, Equetus lanceolatus, found in tropical areas of the Atlantic Ocean, having an elongated dorsal fin that is held erect.
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Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018