にゅうこう 乳溝 LinksSentence search for 乳溝Sentence search for にゅうこうSentence search for ちちみぞKanji details for 乳 and 溝Edit in JMdict Noun1. mammary slit (in whales, dolphins and porpoises)ZoologyNoun2. cleavage (between breasts)Slang, esp. ちちみぞOther forms乳溝 【ちちみぞ】 Discussions Log in to talk about this word.