Brown·ian motion | \ ˈbrau̇-nē-ən- 
\
\Definition of Brownian motion
: a random movement of microscopic particles suspended in liquids or gases resulting from the impact of molecules of the surrounding medium
— called also Brownian movement
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Brownian motion
nounBrown·ian motion | \ ˌbrau̇-nē-ən- \
\Medical Definition of Brownian motion
: a random movement of microscopic particles suspended in liquids or gases resulting from the impact of molecules of the fluid surrounding the particles
— called also Brownian movement
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The first known use of Brownian motion was in 1849
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