SINCE 1828
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actinic focus

noun
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Definition of actinic focus

: the focus at which the chemically most effective rays as distinguished from the visually most effective are brought together (as by a lens)

— called also chemical focus

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First Known Use of actinic focus

1853, in the meaning defined above

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The first known use of actinic focus was in 1853

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Dictionary Entries Near actinic focus

actinic

actinic focus

actinic glass

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Cite this Entry

“Actinic focus.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/actinic%20focus. Accessed 1 Jul. 2022.

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