from The American Heritage® Dictionary of the English Language, 5th Edition.
- noun A large extinct whale of the genus Basilosaurus of the Eocene Epoch, having a long thin body and vestigial hind limbs.
from The Century Dictionary.
- noun A genus of large fossil cetaceans from the Eocene of the southern United States.
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- noun Any of several
extinct cetaceans, of the family Basilosauridae, from the late Eocene
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