keyboard instrument

Short definition from Wiktionary

Noun

1. 1
   Any musical instrument which features a keyboard, such as a piano, synthesizer or celesta.
2. 2
   Any musical instrument that produces sound directly from the manipulation of a keyboard by the performer, including a piano and a celesta.
3. 3
   Any musical instrument (a chordophone) that uses a keyboard to manipulate strings which produce sound, including a piano.