photoaddition

P3H4O1T1O1A1D2D2I1T1I1O1N1

noun

Any bimolecular addition reaction that takes place under the influence of light

OriginEnglish addition ← Middle English addicioun ← Old French adition →
Scrabble 20
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Meanings

nounphotoaddition (plural photoadditions)

plural photoadditions

  1. chemistryAny bimolecular addition reaction that takes place under the influence of light

Origin

  1. Proto-Indo-European*bʰeh₂-
  2. Proto-Indo-European*bʰéh₂os
  3. Proto-Hellenic*pʰáwos
  4. Ancient Greekφᾰ́ος (phắos)
  5. Ancient Greekφῶς (phôs)
  6. Ancient Greekφωτο- (phōto-)
  7. Englishphoto-
  8. Latinadditiō
  9. Old Frenchadition
  10. Middle Englishaddicioun
  11. Englishaddition
  12. Englishphotoaddition

From photo- + addition.

Full word history & related roots →
Cite this entry
APA

photoaddition. (n.d.). In WatkinsX Dictionary. Retrieved November 2, 2026, from https://dictionary.watkinsx.com/word/photoaddition

MLA

“photoaddition.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/photoaddition. Accessed November 2, 2026.

Chicago

WatkinsX Dictionary, s.v. “photoaddition,” accessed November 2, 2026, https://dictionary.watkinsx.com/word/photoaddition.

Source: photoaddition on Wiktionary, CC BY-SA 4.0.