pedesis

from WordNet (r) 3.0 (2006)

pedesis
    n 1: the random motion of small particles suspended in a gas or
         liquid [syn: {Brownian movement}, {Brownian motion},
         {pedesis}]

from The Collaborative International Dictionary of English v.0.48

Pedesis \Pe*de"sis\, n. [NL., from Gr. ph`dhsis a leaping.]
   Same as {Brownian movement}, under {Brownian}.
   [1913 Webster]

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