infradian
infradian[ɪnˈfreɪdɪən]adjective- (Physiology)(of a rhythm or cycle) having a period of recurrence longer than a day; occurring less than once a day
(生理)(节律,周期)亚日的。 比较 ultradian
语源- mid 20th cent.: from infra- 'below' (i.e. expressing a lower frequency), on the pattern of circadian
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