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singingfish

[sing-ing-fish]
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noun, plural (especially collectively) sing·ing·fish, (especially referring to two or more kinds or species) sing·ing·fish·es.
  1. midshipman(def 3).

Origin of singingfish

1880–85, Americanism; singing + fish; so called because of the humming sound it produces with its air bladder
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018