Heterostraci
plural noun
Het·er·os·tra·ci
Definition of Heterostraci
: a class or other division of ostracoderms with widely separated nares and eyes and with an exoskeleton which may consist of a few large plates or numerous placoid scales
Explore M-W
There's more!
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 heterostraci
New Latin, from heter- + Greek ostrakon shell, potsherd — more at ostracon
Seen and Heard
What made you want to look up Heterostraci? Please tell us where you read or heard it (including the quote, if possible).
Writing? Check your grammar now!