ultraviolet filter

noun Photography.
a filter used on a lens to absorb ultraviolet radiation that may impart an undesirable blue cast to a photograph.
Also called UV filter.
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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It is also used to pump the water through the ultraviolet filter.
Consider ultraviolet filter treatments on windows in areas that house library materials.
Finally, an ultraviolet filter kills any remaining bacteria that might have survived.
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