circadian

形容词 circadian:

1. of or relating to biological processes occurring at 24-hour intervals

cir.ca.di.an

adj.Biology （形容词）【生物学】
Relating to or exhibiting approximately 24-hour periodicity.
昼夜节律的，24小时的：与24小时周期相关或大约每24小时周期出现的

来源：
Latin circ3 [around] * see circa
拉丁语 circ3 [绕…一圈] *参见 circa
Latin diôs [day] * see deiw-
拉丁语 diôs [天] *参见 deiw-

【引伸】
circa.dianly
adv.（副词）