plural noun Sphe·nis·ci·dae \sfə̇ˈnisəˌdē\

Definition of Spheniscidae

  1. :  a family of birds (order Sphenisciformes) containing all the existing penguins

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.

Join MWU now and get access to America’s largest dictionary, with:

  • 300,000 words that aren't in our free dictionary
  • Expanded definitions, etymologies, and usage notes
  • Advanced search features
  • Ad free!

Origin and Etymology of spheniscidae

New Latin, from Spheniscus, type genus + -idae

Seen and Heard

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


a rounded knoll or a ridge of ice

Get Word of the Day daily email!