Usually means: Related to or caused by light.
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We found 29 dictionaries that define the word actinic:

General (20 matching dictionaries)
  1. actinic: Merriam-Webster
  2. actinic: Oxford Learner's Dictionaries
  3. actinic: American Heritage Dictionary of the English Language
  4. actinic: Collins English Dictionary
  5. actinic: Vocabulary.com
  6. Actinic, actinic: Wordnik
  7. actinic: Wiktionary
  8. actinic: Webster's New World College Dictionary, 4th Ed.
  9. actinic: The Wordsmyth English Dictionary-Thesaurus
  10. actinic: Infoplease Dictionary
  11. actinic: Dictionary.com
  12. Actinic: Wikipedia, the Free Encyclopedia
  13. Actinic: Online Plain Text English Dictionary
  14. actinic: Webster's Revised Unabridged, 1913 Edition
  15. actinic: Rhymezone
  16. Actinic: AllWords.com Multi-Lingual Dictionary
  17. actinic: FreeDictionary.org
  18. actinic: Mnemonic Dictionary
  19. actinic: TheFreeDictionary.com
  20. actinic: Merriam-Webster

Computing (1 matching dictionary)
  1. actinic: Encyclopedia

Medicine (6 matching dictionaries)
  1. actinic: Merriam-Webster Medical Dictionary
  2. Dorland's Illustrated Medical Dictionary (No longer online)
  3. Actinic: MedTerms.com Medical Dictionary
  4. online medical dictionary (No longer online)
  5. actinic: Medical dictionary
  6. Actinic: Drug Medical Dictionary

Tech (2 matching dictionaries)
  1. Glossary of Meteorology (No longer online)
  2. Washington State Definitions and Abbreviations of Vetrinary Terms (No longer online)

(Note: See actinically as well.)

Definitions from Wiktionary (actinic)

adjective:  Related to radiation; used most often in reference to light, especially in the ultraviolet range.
adjective:  (by extension) Harsh and bright.
adjective:  (medicine) Caused by extensive exposure to ultraviolet light.
adjective:  (chemistry, photography) Of or relating to actinism, the range of photochemical effects produced by exposure to EM radiation, particularly sunlight.
adjective:  Composed of actin.

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