1  definition  found 
 
  From  Webster's  Revised  Unabridged  Dictionary  (1913)  [web1913]: 
 
  Lias  \Li"as\  (l[imac]"as),  n.  [Cf.  F.  lias,  fr  liais  sort  of 
  limestone,  OF  also  liois;  perh.  of  Celtic  origin,  cf  Armor. 
  liach,  leach,  a  stone,  Gael.  leac,  W.  llech.  Cf  {Cromlech}.] 
  (Geol.) 
  The  lowest  of  the  three  divisions  of  the  Jurassic  period;  a 
  name  given  in  England  and  Europe  to  a  series  of  marine 
  limestones  underlying  the  O["o]lite.  See  the  Chart  of 
  {Geology}. 

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