What does 皇太子 mean?
皇太子 is a Japanese noun meaning “crown prince” in English. It is written as 皇太子 in kanji, こうたいし in hiragana, and koutaishi in romaji. This word is part of JLPT N2 vocabulary.
Example sentence
皇太子はそのアメリカ婦人から英語を習った。
The prince learned English from the American lady.