noun, plural (especially collectively) but·ter·fly·fish·es, (especially referring to two or more kinds or species) but·ter·fly·fish.
Origin of butterflyfish
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
any small tropical marine percoid fish of the genera Chaetodon, Chelmon, etc, that has a deep flattened brightly coloured or strikingly marked body and brushlike teeth: family ChaetodontidaeSee also angelfish (def. 1)
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