noun ·Rare ·Advanced level

Definitions

Noun

1. 1
   That property of electromagnetic radiation that leads to the production of photochemical effects uncountable, usually
2. 2
   the property of radiation that enables it to produce photochemical effects wordnet

Synonyms

All synonyms

beamgamma raypatchpencilphotonradiation

Etymology

From actin- + -ism.

Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.