Brownian motion

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brown·i·an move·ment

erratic, nondirectional, zigzag movement observed by ultramicroscope in certain colloidal solutions and by microscope in suspensions of light particulate matter that results from the jostling or bumping of the larger particles by the molecules in the suspending medium which are regarded as being in continuous motion.
[Robert Brown]

Brownian motion

[brou′nyən]
Etymology: Robert Brown, Scottish botanist, 1773-1858
a random movement of microscopic particles suspended in a liquid or gas, such as the continuing erratic behavior of dust particles in still water. The movement is produced by the natural kinetic activity of molecules of the fluid that strike the foreign particles. Also called Brownian movement.

Brown,

Robert, English botanist, 1773-1858.
brownian motion - Synonym(s): brownian movement
brownian movement - rapid random motion of small particles in suspension. Synonym(s): brownian motion; brownian-Zsigmondy movement; molecular movement; pedesis
brownian-Zsigmondy movement - Synonym(s): brownian movement