Jurassic (adj.)youdaoicibaDictYouDict[Jurassic 词源字典]
in reference to "geological period between the Triassic and the Cretaceous," 1847, from French Jurassique, literally "of the Jura Mountains," between France and Switzerland, whose limestones were laid down during this geological period. Used in English in a literal sense "pertaining to the Jura Mountains" by 1831. The name is said to be from Gaulish *iuris "wooded mountain."[Jurassic etymology, Jurassic origin, 英语词源]