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  1  definition  found 
  From  Webster's  Revised  Unabridged  Dictionary  (1913)  [web1913]: 
  Fluidal  \Flu"id*al\,  a. 
  Pertaining  to  a  fluid,  or  to  its  flowing  motion. 
  {Fluidal  structure}  (Geol.),  the  structure  characteristic  of 
  certain  volcanic  rocks  in  which  the  arrangement  of  the 
  minute  crystals  shows  the  lines  of  flow  of  thew  molten 
  material  before  solidification;  --  also  called  {fluxion