Otoko (男) means "man" or "male." It refers to an adult male person. This word is often used to describe gender, distinguish between men and women, or to form compound words such as "otokonoko" (boy), indicating the male sex. Example: 彼は男の先生です。(Kare wa otoko no sensei desu.) = He is a male teacher.

成人の男性を指す言葉です。性別を区別する時に使います。例：彼は男の先生です。