いせい 異性 Common word JLPT N1 Wanikani level 33 Play audio LinksSentence search for 異性Sentence search for いせいKanji details for 異 and 性Edit in JMdict Noun, Noun which may take the genitive case particle 'no'1. the opposite sexSee also 同性Noun, Noun which may take the genitive case particle 'no'2. isomerismChemistry Discussions Log in to talk about this word.