| Noun | 1. | keyboard instrument - a musical instrument that is played by means of a keyboard accordion, piano accordion, squeeze box - a portable box-shaped free-reed instrument; the reeds are made to vibrate by air from the bellows controlled by the player celesta - a musical instrument consisting of graduated steel plates that are struck by hammers activated by a keyboard clavichord - an early stringed instrument like a piano but with more delicate sound musical instrument, instrument - any of various devices or contrivances that can be used to produce musical tones or sounds pipe organ, organ - wind instrument whose sound is produced by means of pipes arranged in sets supplied with air from a bellows and controlled from a large complex musical keyboard forte-piano, piano, pianoforte - a keyboard instrument that is played by depressing keys that cause hammers to strike tuned strings and produce sounds synthesiser, synthesizer - (music) an electronic instrument (usually played with a keyboard) that generates and modifies sounds electronically and can imitate a variety of other musical instruments |