- seiri physiology; menstruation, one's period
In everyday speech, 生理 usually means a menstrual period; the academic sense 'physiology' appears mainly in compounds like 生理学.
今日は生理なので、少し休みます。
Kyō wa seiri nanode, sukoshi yasumimasu.
I'm on my period today, so I'll take a little rest.
生理が遅れているので、少し心配です。
Seiri ga okurete iru node, sukoshi shinpai desu.
My period is late, so I'm a little worried.
⚖️ Don't confuse with 整理 (seiri, 'tidying up'); 生理 refers to menstruation or physiology.
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