zeuglodon

Century Dictionary and Cyclopedia

1. n. The typical genus of the family Zeuglodontidæ. Several species have been described from the Eocene of the United States and of England, as Z. cetoides of the former country, said to have attained a length of 70 feet. The genus had before been named Basilosaurus by Harlan, on the supposition that these fossils were reptiles, and has also been called Hydrarchos (by Koch), Polyptychodon (by Emmons), Phocodon, and Zygodon. See cut under Zeuglodontia.
2. n. [lowercase] A member of this genus; a zeuglodont.

Wiktionary

1. n. A basilosaurus.

GNU Webster's 1913

1. n. (Paleon.) A genus of extinct Eocene whales, remains of which have been found in the Gulf States. The species had very long and slender bodies and broad serrated teeth. See phocodontia.