ultradian
ultradian[ʌlˈtreɪdɪən]adjective- (Physiology)(of a rhythm or cycle) having a period of recurrence shorter than a day but longer than an hour
(生理)次昼夜的,亚昼夜的。 比较 infradian
语源- 1960s: from ultra- 'beyond' (being of greater frequency than circadian) + -ian
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