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  1  definition  found 
  From  Webster's  Revised  Unabridged  Dictionary  (1913)  [web1913]: 
  Hemihedral  \Hem`i*he"dral\,  a.  [Hemi-  +  Gr  ?  seat,  base,  fr  ? 
  to  sit.]  (Crystallog.) 
  Having  half  of  the  similar  parts  of  a  crystals,  instead  of 
  all  consisting  of  half  the  planes  which  full  symmetry  would 
  require,  as  when  a  cube  has  planes  only  on  half  of  its  eight 
  solid  angles,  or  one  plane  out  of  a  pair  on  each  of  its 
  edges;  or  as  in  the  case  of  a  tetrahedron,  which  is 
  hemihedral  to  an  octahedron,  it  being  contained  under  four  of 
  the  planes  of  an  octahedron.  --  {Hem`i*he"dral*ly},  adv