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malacopterygian

[mal-uh-kop-tuh-rij-ee-uh n]
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adjective
  1. belonging or pertaining to the Malacopterygii (Malacopteri), a group of soft-finned, teleost fishes.
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Origin of malacopterygian

1825–35; < New Latin Malacopterygi(i) (malaco- malaco- + -pterygii, plural of -pterygius finned, winged, adj. derivative of Greek pterýgion, diminutive of ptéryx wing, fin) + -an
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for malacopterygian

malacopterygian

adjective
  1. of, relating to, or belonging to the Malacopterygii, a group of teleost fishes, including herrings and salmon, having soft fin rays
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noun
  1. any malacopterygian fish; a soft-finned fish
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Word Origin

C19: from New Latin Malacopterygii, from malaco- + Greek pterux wing, fin
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