mosasaur

M3O1S1A1S1A1U1R1

noun

A large extinct marine reptile in the family †Mosasauridae, dominant marine predator of the Cretaceous. Mosasaurs are considered to belong to Squamata, the same group that includes lizards and snakes.

First used c. 1840Scrabble 10

Meanings

nounmosasaur (plural mosasaurs)

plural mosasaurs

  1. A large extinct marine reptile in the family †Mosasauridae, dominant marine predator of the Cretaceous. Mosasaurs are considered to belong to Squamata, the same group that includes lizards and snakes.First known use c. 1840

    Mosasaurs could reach lengths of up to 17m and lived mainly in offshore waters of the Late Cretaceous.

    2012, Winand Brinkmann, Kenneth De Baets, editors, Paleontological Museum of the University of Zürich: Exhibition Guide, Paleontological Institute and Museum of the University of Zürich, →ISBN, page 70
    1 more example

    What I find deeply disturbing, however, is that Mr. Ross could believe that the earth was created 10,000 years ago, but nevertheless write in his dissertation that mosasaurs, or marine reptiles, existed more than 65 million years ago.

    2007 February 14, “The Case of the Creationist Geologist (5 Letters)”, in New York Times

Origin

From scientific Latin Mosasaurus (genus name).

Full word history & related roots →

Translations

German Mosasaurier
  • Mosasaurierextinct marine reptile in family Mosasauridae
Italian mosasauro
  • mosasauroextinct marine reptile in family Mosasauridae
Polish mozazaur
  • mozazaurextinct marine reptile in family Mosasauridae
Portuguese mosassauro
  • mosassauroextinct marine reptile in family Mosasauridae
Russian мозаза́вр
  • мозаза́вр (mozazávr)extinct marine reptile in family Mosasauridae
Spanish mosasáurido, mosasaurio
  • mosasáuridoextinct marine reptile in family Mosasauridae
  • mosasaurioextinct marine reptile in family Mosasauridae
Cite this entry
APA

mosasaur. (n.d.). In WatkinsX Dictionary. Retrieved November 2, 2026, from https://dictionary.watkinsx.com/word/mosasaur

MLA

“mosasaur.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/mosasaur. Accessed November 2, 2026.

Chicago

WatkinsX Dictionary, s.v. “mosasaur,” accessed November 2, 2026, https://dictionary.watkinsx.com/word/mosasaur.

Source: mosasaur on Wiktionary, CC BY-SA 4.0.