Dictionary.com
definitions

spiny-finned

[spahy-nee-find]
adjective Ichthyology.
  1. having fins with sharp bony rays, as an acanthopterygian.

Origin of spiny-finned

First recorded in 1880–85
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
British Dictionary definitions for spiny-finned

spiny-finned

adjective
  1. (of certain fishes) having fins that are supported by stiff bony spinesSee also acanthopterygian Compare soft-finned
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