かこう 河口 Common word LinksSentence search for 河口Sentence search for かこうSentence search for かわぐちSentence search for 川口Kanji details for 河 and 口Edit in JMdict Noun, Noun which may take the genitive case particle 'no'1. mouth of river; estuaryWikipedia definition2. KawaguchiOther forms河口 【かわぐち】、川口 【かわぐち】 Discussions Log in to talk about this word.