Brownian movement

Brown′i•an move′ment [Physics.]

Physicsthe irregular motion of small particles suspended in a liquid or a gas, caused by the bombardment of the particles by molecules of the medium: first observed by Robert Brown in 1827. Also called Brown′ian mo′tion.

Collins Concise English Dictionary © HarperCollins Publishers::

Brownian movement /ˈbraʊnɪən/, Brownian motion n

random movement of microscopic particles suspended in a fluid, caused by bombardment of the particles by molecules of the fluid. First observed in 1827, it provided strong evidence in support of the kinetic theory of molecules

Etymology: 19th Century: named after Robert Brown

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