じゅうはちにち 18日 Common word LinksSentence search for 18日Sentence search for じゅうはちにちSentence search for 十八日Sentence search for 一八日Kanji details for 日Edit in JMdict Noun1. 18th day of the monthNoun2. 18 daysPlace3. JuuhachinichiOther forms十八日 【じゅうはちにち】、一八日 【じゅうはちにち】 Discussions Log in to talk about this word.