Brownian movement[bro̵un′ē ən]
Brownian movement definition by Webster's New World
Webster's New World College Dictionary Copyright © 2010 by Wiley Publishing, Inc., Cleveland, Ohio. Used by arrangement with John Wiley & Sons, Inc.
the constant, random, zigzag movement of small particles dispersed in a fluid medium, caused by collision with molecules of the fluid
Origin: after R. Brown (1773-1858), British botanist who described it
brownian movement - Medical Definition
The random movement of microscopic particles suspended in a liquid or gas, caused by collisions with molecules of the surrounding medium. Also called Brownian motion, molecular movement, pedesis.