Pronunciation: (sin'ur-jist, si-nûr'-),[key] —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.