adj.
Pronunciation: ˌ f ō -t ō - ' ke-mi-k ə l
Function: adjective
Date: 1857
1 : of, relating to, or resulting from the chemical action of radiant energy and especially light < photochemical smog>
2 : of or relating to photochemistry < photochemical studies>
– pho · to · chem · i · cal · ly \ -k( ə -)l ē \ adverb