from The American Heritage® Dictionary of the English Language, 4th Edition
- adj. Of, belonging to, or designating the era of geologic time that includes the Triassic, Jurassic, and Cretaceous periods and is characterized by the development of flying reptiles, birds, and flowering plants and by the appearance and extinction of dinosaurs. See Table at geologic time.
- n. The Mesozoic Era.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- adj. Of a geologic era within the Phanerozoic eon that comprises the Triassic, Jurassic and Cretaceous periods from about 230 to 65 million years ago, when life on earth was dominated by reptiles.
- proper n. The Mesozoic era.
from the GNU version of the Collaborative International Dictionary of English
- adj. Belonging, or relating, to the secondary or reptilian age, or the era between the Paleozoic and Cenozoic. See Chart of geology.
- n. The Mesozoic age or formation.
from The Century Dictionary and Cyclopedia
- In geology, lying, as a part of the geological series so designated, between the Paleozoic and the Tertiary rocks.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. from 230 million to 63 million years ago
- adj. of or relating to or denoting the Mesozoic era
meso- + -zoic (Wiktionary)