Meaning of roller board in English:

roller board

Pronunciation /ˈrəʊlə ˌbɔːd/

noun

  • 1Music
    The board to which the rollers are attached in an organ; the board and rollers considered collectively as part of the tracker action of an organ.

    Recorded earliest in attributive use.

  • 2A board mounted on rollers.

Origin

Mid 17th century. From roller + board.