plural noun
Si·​pho·​na·​ri·​idae | \ ˌsīfənəˈrīəˌdē \

Definition of Siphonariidae

: a family of littoral gastropod mollusks (order Opisthobranchia) that cling to rocks along seacoasts, resemble limpets, and have both gills and a pulmonary sac

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 Siphonariidae

New Latin, from Siphonaria, type genus + -idae

Keep scrolling for more

Learn More about Siphonariidae

Statistics for Siphonariidae

Cite this Entry

“Siphonariidae.” The Dictionary, Merriam-Webster Inc., Accessed 9 December 2019.

Comments on Siphonariidae

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


contradictory or incongruous words

Get Word of the Day daily email!

Test Your Vocabulary

Semantic Drift Quiz

  • a twisty river
  • Which of the following was once a synonym for fun?
Spell It

Can you spell these 10 commonly misspelled words?

Add Diction

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

Love words? Need even more definitions?

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