Merriam-Webster Logo
SINCE 1828
Menu
dictionary thesaurus

Mytilidae

plural noun
My·​til·​i·​dae | \ mīˈtiləˌdē\

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!

History and Etymology for Mytilidae

New Latin, from Mytilus, type genus + -idae

Keep scrolling for more

Learn More about Mytilidae

Dictionary Entries near Mytilidae

mythy

Mytilacea

mytilid

Mytilidae

mytiliform

Mytilus

my word

Statistics for Mytilidae

Look-up Popularity

Comments on Mytilidae

What made you want to look up Mytilidae? Please tell us where you read or heard it (including the quote, if possible).

Show Comments  Hide Comments 

WORD OF THE DAY

detritus

Listen to the pronounciation of detritus

miscellaneous remnants or debris

Get Word of the Day daily email!

Test Your Vocabulary

The Exceptions Quiz III

  • one green toy robot amidst many red toy robots
  • Which of these words does not mean "nonsense"?
How Strong Is Your Vocabulary?

Test your vocabulary with our 10-question quiz!

TAKE THE QUIZ
Add Diction

Test Your Knowledge - and learn some interesting things along the way.

TAKE THE QUIZ
Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!

Words at Play
Ask the Editors
Word Games