noun Bas·i·lo·sau·rus \ˌbasəlōˈsȯrəs\

Definition of Basilosaurus

  1. :  a genus (the type of the family Basilosauridae) of large slender-bodied Eocene whales that are found most abundantly in Alabamian and Floridian rocks and that have serrated posterior teeth with two roots — see zeuglodontia

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 basilosaurus

New Latin, from Greek basileus king + New Latin -o- + -saurus

Seen and Heard

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


to help become familiar with something

Get Word of the Day daily email!