Definition of mosasaurid in US English:

mosasaurid

noun

  • A reptile of the extinct family Mosasauridae; a mosasaur.

Origin

Late 19th century; earliest use found in James Dana (1813–1895), geologist, zoologist, and teacher. From mosasaur + -id, after scientific Latin Mosasauridae, family name from Mosasaurus + -idae.

Pronunciation

mosasaurid

/ˌməʊsəˈsɔːrɪd/