外(がい)〜 がい prefix foreign; outside; external medical 1. foreign; external Prefix indicating something is from abroad or outside. 外車(がいしゃ)は維持費(いじひ)が高(たか)い。🔊 Foreign cars have high maintenance costs. 外(がい) + 車(しゃ) = foreign car 外来(がいらい)語(ご)は年々(ねんねん)増(ふ)えている。🔊 Foreign loanwords are increasing every year. 外(がい) + 来(らい) = foreign-origin 外国語(がいこくご)を学(まな)ぶのは楽(たの)しい。🔊 Learning a foreign language is fun. 2. outside; exterior Prefix indicating the outer or external aspect of something. 外(がい)からの圧力(あつりょく)に屈(く)しない。🔊 I won't yield to outside pressure. Used as standalone noun meaning 'outside' 外壁(がいへき)を塗(ぬ)り替(か)える。🔊 Repaint the exterior walls. 外見(がいけん)だけで人(ひと)を判断(はんだん)してはいけない。🔊 You shouldn't judge people by their appearance alone. 外(がい)〜 is a productive prefix meaning 'foreign' or 'outside.'Compounds外国(がいこく) (foreign country)外人(がいじん) (foreigner - informal)外来(がいらい) (foreign-origin; outpatient)外車(がいしゃ) (foreign car)外科(げか) (surgery - medical department)外交(がいこう) (diplomacy)外見(がいけん) (outward appearance)外出(がいしゅつ) (going out)外食(がいしょく) (eating out)Antonym prefix内(ない)〜 (internal; inside) Related Words Antonym: 内(ない)〜 (internal; inside) Related: 外(そと) (outside (kun reading)) general Added 2026.1.13 16:20 · Revised 2026.9.2 11:55 03500/03948_gai