noun, plural (especially collectively) rat·fish, (especially referring to two or more kinds or species) rat·fish·es.
  1. a chimaera, Hydrolagus colliei, of the Pacific Ocean from Alaska to Baja California, having a ratlike tail.

Origin of ratfish

An Americanism dating back to 1880–85; rat + fish
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for ratfish


noun plural -fish or -fishes
  1. another name for rabbitfish (def. 1)
  2. a chimaera, Hydrolagus colliei, of the North Pacific Ocean, which has a long narrow tail
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