Home/ultradianultradian/uhl-trey-dee-uhn/US // ʌlˈtreɪ di ən //超昼夜,超日照,超时空,超昼夜温差Definitionsadj.形容词 adjective1: of or relating to a biorhythm having a period of less than 24 hours.Level 5Browse all words →