Pōl'y-zō'nal, a.

a. [Gr. πολὺς, many, and ζώνη, belt, girdle, from ζωννύναι, to gird.] Consisting of many zones or rings.

Polyzonal lens (Opt.), a lens made up of many pieces arranged in zones or rings;—a plan sometimes resorted to from the difficulty of obtaining large pieces of glass free from defects.