plural noun Si·ren·oi·dei \ˌsīrə̇ˈnȯidēˌī\
variants: less commonly



Definition of Sirenoidei

in some classifications

  1. :  a group of lungfishes containing the genera Neoceratodus and Lepidosiren and some extinct forms from the Mesozoic

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 sirenoidei

New Latin, from Latin siren + New Latin -oidei, -oidea

Seen and Heard

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


a trip made at another's expense

Get Word of the Day daily email!