鍵けん

noun

key (of a piano, organ, etc.)

Refers specifically to the individual keys on keyboard instruments like pianos and organs.

• ピアノの鍵けんを一ひとつずつ押おしてみた。

  I tried pressing each key of the piano one by one.

• このオルガンは鍵けんの数かずが多おおい。

  This organ has many keys.