noun
chorus (esp. in Greek drama); choir
Primarily refers to the chorus in ancient Greek drama, but can also mean a choir or singing group in a broader sense.
from Greek choros
ギリシャ悲劇では、コロスが物語の進行に重要な役割を果たす。
In Greek tragedy, the chorus plays an important role in advancing the story.
このオペラのコロスは迫力がある。
The chorus in this opera is powerful.