Definition of Mytilidae
: a family of marine bivalve mollusks (order Filibranchia) having the shell elongated and equivalve with a large narrow internal ligament and a byssus for attachment to the substrate — compare mussel
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 mytilidae
New Latin, from Mytilus, type genus + -idae
Seen and Heard
What made you want to look up Mytilidae? Please tell us where you read or heard it (including the quote, if possible).