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WordReference Random House Unabridged Dictionary of American English © 2024Per•rin (pe ran′),USA pronunciation n. Jean Bap•tiste (zhän ba tēst′),USA pronunciation 1870–1942, French physicist and chemist: Nobel prize for physics 1926.
Collins Concise English Dictionary © HarperCollins Publishers:: Perrin /French: pɛrɛ̃/ n - Jean Baptiste (ʒɑ̃ batist). 1870–1942, French physicist. His researches on the distribution and diffusion of particles in colloids (1911) gave evidence for the physical reality of molecules, confirmed the explanation of Brownian movement in terms of kinetic theory, and determined the magnitude of the Avogadro constant. He also studied cathode rays: Nobel prize for physics 1926
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