psoralen

noun

pso·​ra·​len ˈsȯr-ə-lən How to pronounce psoralen (audio)
: a substance C11H6O3 found in some plants that photosensitizes mammalian skin and is used in conjunction with ultraviolet light to treat psoriasis
also : any of various derivatives of psoralen having similar properties

Examples of psoralen in a Sentence

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Examples are automatically compiled from online sources to show current usage. Read More Opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback.
There are several different types of phototherapy—including narrowband UVB, broadband UVB, targeted UVB [excimer laser or light], and UVA with psoralens (topical, oral, or bath)—and all of them involve exposing the skin to light. — Jenna Birch, SELF, 28 Oct. 2019

Word History

Etymology

New Latin Psoralea, genus of plants from which it is isolated + English -en, alteration of -ene

First Known Use

1933, in the meaning defined above

Time Traveler
The first known use of psoralen was in 1933

Rhymes for psoralen

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Browse Nearby Words

Psoralea
psoralen
Psorergates
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Cite this Entry

“Psoralen.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/psoralen. Accessed 7 Jul. 2026.

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Medical Definition

psoralen

noun
pso·​ra·​len ˈsȯr-ə-lən How to pronounce psoralen (audio)
: a substance C11H6O3 found in some plants that photosensitizes mammalian skin and is used in conjunction with ultraviolet light to treat psoriasis
also : any of various derivatives of psoralen having similar properties see puva
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