1. United States chemist noted for discovering the series of chemical reactions in photosynthesis (1911-) • Syn: Melvin Calvin • Instance Hypernyms: chemist 2. Swiss theologian (born in France) whose tenets (predestination and the irresistibility of grace and justification by faith) defined Presbyterianism (1509-1564) • Syn: John Calvin, Jean Cauvin, Jean Caulvin, Jean Chauvin • Instance Hypernyms: theologian, theologist, theologizer, theologiser