The Collaborative International Dictionary of English v.0.48:

Ribible \Rib"i*ble\, n. [See Ribibe.]
   A small threestringed viol; a rebec. --Moore (Encyc. of
   Music).
   [1913 Webster]

         All can be play on gittern or ribible.   --Chaucer.
   [1913 Webster]