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  1  definition  found 
  From  Webster's  Revised  Unabridged  Dictionary  (1913)  [web1913]: 
  Diabase  \Di"a*base\,  n.  [F.  diabase,  fr  Gr  ?  a  crossing  or 
  passing  over  fr  ?;  ?  +  ?  to  go  --  so  called  by  Brongniart 
  because  it  passes  over  to  diorite.]  (Min.) 
  A  basic,  dark-colored,  holocrystalline,  igneous  rock, 
  consisting  essentially  of  a  triclinic  feldspar  and  pyroxene 
  with  magnetic  iron;  --  often  limited  to  rocks  pretertiary  in 
  age.  It  includes  part  of  what  was  early  called  greenstone.