noun
- From 135 million to 63 million years ago; end of the age of reptiles; appearance of modern insects and flowering plants.
- synonyms: Cretaceous period
adjective
- Abounding in chalk.
- Of or relating to or denoting the third period of the Mesozoic era. .
WordNet 3.0 © 2006 by Princeton University
| APA | WordNet. (2010). cretaceous. Retrieved September 20, 2026, from http://smartdefine.org/cretaceous/definitions/1249816 |
| Chicago | WordNet. 2010. "cretaceous" http://smartdefine.org/cretaceous/definitions/1249816 (accessed September 20, 2026). |
| Harvard | WordNet 2010, cretaceous, Smart Define, viewed 20 September, 2026, <http://smartdefine.org/cretaceous/definitions/1249816>. |
| MLA | WordNet. "cretaceous" 23 October 2010. Web. 20 September 2026. <http://smartdefine.org/cretaceous/definitions/1249816> |