/sin"euhr jist, si nerr"-/ , n.
1. Physiol. , Med. a body organ, medicine, etc., that cooperates with another or others to produce or enhance an effect.
2. Chem. , Pharm. any admixture to a substance for increasing the effectiveness of one or more of its properties.
3. Theol. a person who holds the doctrine of synergism.
[ 1650-60; synergista synerg ( ós ) (see SYNERGISM) + NL -ista -IST ]