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Definition of Reactant
1. Noun. A chemical substance that is present at the start of a chemical reaction.
Definition of Reactant
1. one that reacts [n -S] - See also: reacts
Medical Definition of Reactant
1. A substance taking part in a chemical reaction. Acute phase reactants, A group of proteins that are produced and/or released in increased concentrations during the acute phase reaction, including fibrinogen; C-reactive protein; complement proteins B, C3, C4; a2-acid glycoprotein, serum amyloid A, proteinase inhibitors, etc. (05 Mar 2000)