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  1  definition  found 
  From  Webster's  Revised  Unabridged  Dictionary  (1913)  [web1913]: 
  Brownian  \Brown"i*an\,  a. 
  Pertaining  to  Dr  Robert  Brown,  who  first  demonstrated  (about 
  1827)  the  commonness  of  the  motion  described  below. 
  {Brownian  movement},  the  peculiar,  rapid,  vibratory  movement 
  exhibited  by  the  microscopic  particles  of  substances  when 
  suspended  in  water  or  other  fluids.