basilosaurus

 
Pronunciation: /ˌbasɪlə(ʊ)ˈsɔːrəs/

noun

  • a large marine cetacean of the Eocene epoch, having rudimentary fore and hind limbs.
    • Genus Basilosaurus, suborder Archaeoceti, order Cetacea

Origin:

modern Latin, from Greek basileus 'king' + sauros 'lizard'