Definition of spiny ray
: a fin ray that is stiff, unbranched, pointed at the end, and lacking transverse segmentation, that occurs singly or grouped in the anterior part of the dorsal fin in many fishes or in the first dorsal when there are two as well as in the anal and ventral fins, and that was in former classifications the principal character of the group Acanthopterygii —opposed to soft ray
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!
Seen and Heard
What made you want to look up spiny ray? Please tell us where you read or heard it (including the quote, if possible).