polyzonal

1 definition found

polyzonal - Collaborative International Dictionary of English v.0.48 :

  Polyzonal \Pol`y*zon"al\, a. [Poly- + zonal.]
     Consisting of many zones or rings.
     [1913 Webster]
  
     Polyzonal lens (Opt.), a lens made up of pieces arranged
        zones or rings, -- used in the lanterns of lighthouses.
        [1913 Webster]