三歳

さんさい【三歳】

three years of age.

●三歳の童子もこれを知る. ＝三尺の童子もこれを知る. (⇒さんじゃくのどうじ).

三歳児 a three-year-old (child).

●三歳児健診 a health examination for children of 3 years of age.