Hypertext Webster Gateway: "Polyzonal"
From Webster's Revised Unabridged Dictionary (1913) (web1913)
Polyzonal \Pol`y*zon"al\, a. [Poly- + zonal.]
Consisting of many zones or rings.
{Polyzonal lens} (Opt.), a lens made up of pieces arranged
zones or rings, -- used in the lanterns of lighthouses.
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