Nautiloidea

plural noun Nau·ti·loi·dea

Definition of Nautiloidea

1 :an order or other subdivision of Tetrabranchia comprising cephalopods having an external chambered shell that is either straight (as in Orthoceras) or variously curved or coiled and being important in the Ordovician and especially the Silurian but now represented only by the genus Nautilus
2 in some classifications :a subclass or other subdivision of Cephalopoda that is coextensive with Tetrabranchia

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!
Already a subscriber? Log in.

Origin and Etymology of nautiloidea

New Latin, from Nautilus + -oidea


Seen and Heard

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

Love words? Need even more definitions?

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

WORD OF THE DAY

a ram's-horn trumpet used in Judaism

Get Word of the Day daily email!

Love words? Need even more definitions?

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