noun, plural (especially collectively) dol·lar·fish, (especially referring to two or more kinds or species) dol·lar·fish·es.
Origin of dollarfish
First recorded in 1840–50; so called because of its roundish shape and silvery color
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
noun plural -fish or -fishes
any of various fishes that have a rounded compressed silvery body, esp the moonfishes or the American butterfish
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