こうない 口内 LinksSentence search for 口内Sentence search for こうないSentence search for 咥内Kanji details for 口 and 内Edit in JMdict Noun which may take the genitive case particle 'no', Noun1. oral; in the mouthPlace2. KounaiOther forms咥内 【こうない】Notes咥内: Irregular kanji usage. Discussions Log in to talk about this word.