名詞 etude:

1. a short composition for a solo instrument; intended as an exercise or to demonstrate technical virtuosity

1. The pianist concluded the concert with a Chopin etude.
   鋼琴家以肖邦的一支練習曲結束音樂會。

e.tude

n.Music （名詞）【音樂】
A piece composed for the development of a specific point of technique.
練習曲：為練習某種特殊演奏技巧的樂曲
A composition featuring a point of technique but performed because of its artistic merit.
練習曲：亦指為了練習某一技巧但又有演奏藝術價值的樂曲

來源：
French étude
法語 étude
from Old French estudie [study] * see study
源自 古法語 estudie [學習] *參見 study