3  definitions  found 
 
  From  Webster's  Revised  Unabridged  Dictionary  (1913)  [web1913]: 
 
  Girder  \Gird"er\,  n.  [From  {Gird}  to  sneer  at.] 
  One  who  girds;  a  satirist. 
 
  From  Webster's  Revised  Unabridged  Dictionary  (1913)  [web1913]: 
 
  Girder  \Gird"er\,  n.  [From  {Gird}  to  encircle.] 
  1.  One  who  or  that  which  girds. 
 
  2.  (Arch.  &  Engin.)  A  main  beam;  a  stright,  horizontal  beam 
  to  span  an  opening  or  carry  weight,  such  as  ends  of  floor 
  beams,  etc.;  hence  a  framed  or  built-up  member 
  discharging  the  same  office,  technically  called  a  compound 
  girder.  See  Illusts  of  {Frame},  and  {Doubleframed  floor}, 
  under  {Double}. 
 
  {Bowstring  girder},  {Box  girder},  etc  See  under  {Bowstring}, 
  {Box},  etc 
 
  {Girder  bridge}.  See  under  {Bridge}. 
 
  {Lattice  girder},  a  girder  consisting  of  longitudinal  bars 
  united  by  diagonal  crossing  bars. 
 
  {Half-lattice  girder},  a  girder  consisting  of  horizontal 
  upper  and  lower  bars  connected  by  a  series  of  diagonal 
  bars  sloping  alternately  in  opposite  directions  so  as  to 
  divide  the  space  between  the  bars  into  a  series  of 
  triangles.  --Knight. 
 
  {Sandwich  girder},  a  girder  consisting  of  two  parallel  wooden 
  beams,  between  which  is  an  iron  plate,  the  whole  clamped 
  together  by  iron  bolts. 
 
  From  WordNet  r  1.6  [wn]: 
 
  girder 
  n  :  a  beam  made  usually  of  steel;  a  main  support  in  a  structure 

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