[re.agent] n [NL reagent-, reagens, prp. of reagere to react--more at react] (1797): a substance used (as in detecting or measuring a component, in preparing a product, or in developing photographs) because of its chemical or biological activity
REAGENT
Meaning of REAGENT in English
Merriam-Webster English vocab. Английский словарь Merriam Webster. 2012