せいり 生理 Common word JLPT N1 LinksSentence search for 生理Sentence search for せいりKanji details for 生 and 理Edit in JMdict Noun, Noun which may take the genitive case particle 'no'1. physiologyNoun, Noun which may take the genitive case particle 'no'2. menstruation; one's period; mensesSee also 月経 Discussions Log in to talk about this word.