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zone plate
noun
Optics
.
a plate or screen with alternating opaque and transparent concentric rings that focus light by diffraction.
Origin of zone plate
First recorded in 1895–1900
Words nearby zone plate
zone of illuviation
,
zone of interior
,
zone of leaching
,
zone of saturation
,
zone out
,
zone plate
,
zone refining
,
zone system
,
zone time
,
zonesthesia
,
zonetime