Definition of Acanthopterygii
in many classifications
: a superorder or other category of teleost fishes containing originally all those having the anterior rays of the dorsal and anal fins stiff and spiny (as the basses, perches, and mackerels) or now those usually lacking a duct to the air bladder, having no mesocoracoid bone, and having the pectoral arch suspended from the skull, the ventral fins attached to the clavicular arch, and the gill opening in front of the pectoral fin (as most of the spiny-finned and some soft-finned fishes)
Love words? You must — there are over 200,000 words in our free online dictionary, but you are looking for one that’s only in the Merriam-Webster Unabridged Dictionary.
Start your free trial today and get unlimited access to America's largest dictionary, with:
- More than 250,000 words that aren't in our free dictionary
- Expanded definitions, etymologies, and usage notes
- Advanced search features
- Ad free!
Origin and Etymology of acanthopterygii
New Latin, from acanth- + -pterygii (from Greek pterygion fin, small wing)
First Known Use: 1751
Seen and Heard
What made you want to look up Acanthopterygii? Please tell us where you read or heard it (including the quote, if possible).