noun
Refers to a child with exceptional talent or genius, often in academics, arts, or music.
彼は数学の天才児として知られている。
He is known as a child prodigy in mathematics.
そのピアニストは5歳で天才児と呼ばれた。
The pianist was called a child prodigy at age five.
Compound of 天才 (tensai, 'genius') and 児 (ji, 'child'). The exact historical derivation is uncertain, but the word follows a standard Sino-Japanese pattern.