re‧a‧gent /riˈeɪdʒ
ənt/
noun [countable] technical[
Date: 1700-1800;
Language: Modern Latin;
Origin: present participle of reagere 'to react', from Latin agere 'to act']
a substance that shows that another substance in a
compound exists, by causing a chemical
reaction [TahlilGaran] Dictionary of Contemporary English ▲