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brownian |
1 definition found From Webster's Revised Unabridged Dictionary (1913) [web1913]: Brownian \Brown"i*an\, a. Pertaining to Dr Robert Brown, who first demonstrated (about 1827) the commonness of the motion described below. {Brownian movement}, the peculiar, rapid, vibratory movement exhibited by the microscopic particles of substances when suspended in water or other fluids.