ˌbasəlōˈsȯrəs noun
Usage: capitalized
Etymology: New Latin, from Greek basileus king + New Latin -o- + -saurus
: 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