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  1  definition  found 
  From  Webster's  Revised  Unabridged  Dictionary  (1913)  [web1913]: 
  Conchoidal  \Con*choid"al\,  a.  [Cf.  F.  concho["i]dal.]  (Min.) 
  Having  elevations  or  depressions  in  form  like  one  half  of  a 
  bivalve  shell;  --  applied  principally  to  a  surface  produced 
  by  fracture.