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