keybed

Meanings

1. The support structure of the key of a piano or other keyboard instrument upon which the key rests when fully depressed.
2. The sturdy, flat structure of the cabinet of a piano or other keyboard instrument upon which rests the keyframe, holding all of the keys of the instrument.
3. The entire assembly consisting of the keys and action of a digital or electronic piano - particularly used for digital and electronic instruments in which most parts of the action are located underneath they key itself, and for which the keys, action, keystops, associated electronics, and other related parts are a single integrated assembly.

Etymology

From key + bed.