6  definitions  found 
 
  From  Webster's  Revised  Unabridged  Dictionary  (1913)  [web1913]: 
 
  Grating  \Grat"ing\,  n.  (Optics) 
  A  system  of  close  equidistant  parallel  lines  or  bars,  esp. 
  lines  ruled  on  a  polished  surface,  used  for  producing  spectra 
  by  diffraction.  Gratings  have  been  made  with  over  40,000  such 
  lines  to  the  inch,  but  those  with  a  somewhat  smaller  number 
  give  the  best  definition. 
 
  From  Webster's  Revised  Unabridged  Dictionary  (1913)  [web1913]: 
 
  Grate  \Grate\,  v.  t.  [imp.  &  p.  p.  {Grated};  p.  pr  &.  vb  n. 
  {Grating}.] 
  To  furnish  with  grates;  to  protect  with  a  grating  or 
  crossbars;  as  to  grate  a  window. 
 
  From  Webster's  Revised  Unabridged  Dictionary  (1913)  [web1913]: 
 
  Grating  \Grat"ing\,  n.  [See  2d  Grate.] 
  1.  A  partition,  covering,  or  frame  of  parallel  or  cross  bars; 
  a  latticework  resembling  a  window  grate;  as  the  grating 
  of  a  prison  or  convent. 
 
  2.  (Optics)  A  system  of  close  equidistant  and  parallel  lines 
  lines  or  bars,  especially  lines  ruled  on  a  polished 
  surface,  used  for  producing  spectra  by  diffraction;  -- 
  called  also  {diffraction  grating}. 
 
  3.  pl  (Naut.)  The  strong  wooden  lattice  used  to  cover  a 
  hatch,  admitting  light  and  air;  also  a  movable  Lattice 
  used  for  the  flooring  of  boats.  [1913  Webster] 
 
  From  Webster's  Revised  Unabridged  Dictionary  (1913)  [web1913]: 
 
  Grating  \Grat"ing\,  a.  [See  {Grate}  to  rub  harshy.] 
  That  grates;  making  a  harsh  sound;  harsh.  --  {Grat"ing*ly}, 
  adv 
 
  From  Webster's  Revised  Unabridged  Dictionary  (1913)  [web1913]: 
 
  Grating  \Grat"ing\,  n. 
  A  harsh  sound  caused  by  attrition. 
 
  From  WordNet  r  1.6  [wn]: 
 
  grating 
  adj  :  unpleasantly  harsh  or  grating  in  sound;  "a  gravelly  voice" 
  [syn:  {gravel},  {gravelly},  {rasping},  {raspy},  {rough}] 
  n  1:  a  barrier  that  has  parallel  or  crossed  bars  blocking  a 
  passage  but  admitting  air  [syn:  {grate}] 
  2:  a  frame  of  iron  bars  to  hold  a  fire  [syn:  {grate}] 
  3:  a  surface  with  many  parallel  grooves  in  it  disperses  a  beam 
  of  light  (or  other  electromagnetic  radiation)  into  its 
  wavelengths  to  produce  its  spectrum  [syn:  {diffraction 
  grating}] 

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