photochemical adjective 1noun 1forms 1 adjective1 •Of, relating to, or produced by photochemistry or by photochemical reactions.The O–O bond in benzoyl peroxide and the C–N bonds in AIBN homolyze under thermal or photochemical conditions. — 2007 noun1 •Any chemical compound (such as silver halides) used in photography. formsphotochemicals
