黒こっ鍵けんこっけんMeanings1nounblack keyRefers specifically to the black keys on a piano, organ, or similar keyboard instrument. Often contrasted with 白鍵 (white key).See also: 白鍵ピアノの黒鍵こっけんはぜんぶは全部でさんじゅで36個うろっこある。There are 36 black keys on a piano in total.
