黒こっ鍵けん

noun

black key

Refers specifically to the black keys on a piano, organ, or similar keyboard instrument. Often contrasted with 白鍵 (white key).

See also: 白鍵

• ピアノの黒こっ鍵けんは全ぜん部ぶで36個こある。

  There are 36 black keys on a piano in total.

• この曲きょくは黒こっ鍵けんだけで弾ひける。

  This piece can be played using only the black keys.