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ultraviolet filter

American

noun

Photography.

a filter used on a lens to absorb ultraviolet radiation that may impart an undesirable blue cast to a photograph.

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ultraviolet filter

The couple are awake by 6:30 a.m. to ensure that the municipal supply is running, and they use an ultraviolet filter to purify water intended for drinking or cooking because contamination is constant.

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Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023