| a calculus or concretion found in the stomach or intestines of certain animals, esp. ruminants, formerly reputed to be an effective remedy for poison. |
| an extraordinary or unusual thing, person, or event; an exceptional example or instance. |
reagent re·a·gent (rē-ā'jənt)
n.
A substance used in a chemical reaction to detect, measure, examine, or produce other substances.
| reagent (rē-ā'jənt) Pronunciation Key
A substance participating in a chemical reaction, especially one used to detect, measure, or produce another substance. Compare agent. |