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achromatic

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achromatic


  2  definitions  found 
 
  From  Webster's  Revised  Unabridged  Dictionary  (1913)  [web1913]: 
 
  Achromatic  \Ach`ro*mat"ic\,  a.  [Gr.  ?  colorless;  'a  priv.  +  ?, 
  ?,  color:  cf  F.  achromatique.] 
  1.  (Opt.)  Free  from  color;  transmitting  light  without 
  decomposing  it  into  its  primary  colors. 
 
  2.  (Biol.)  Uncolored;  not  absorbing  color  from  a  fluid;  -- 
  said  of  tissue. 
 
  {Achromatic  lens}  (Opt.),  a  lens  composed  usually  of  two 
  separate  lenses,  a  convex  and  concave,  of  substances 
  having  different  refractive  and  dispersive  powers,  as 
  crown  and  flint  glass,  with  the  curvatures  so  adjusted 
  that  the  chromatic  aberration  produced  by  the  one  is 
  corrected  by  other  and  light  emerges  from  the  compound 
  lens  undecomposed. 
 
  {Achromatic  prism}.  See  {Prism}. 
 
  {Achromatic  telescope},  or  {microscope},  one  in  which  the 
  chromatic  aberration  is  corrected,  usually  by  means  of  a 
  compound  or  achromatic  object  glass,  and  which  gives 
  images  free  from  extraneous  color. 
 
  From  WordNet  r  1.6  [wn]: 
 
  achromatic 
  adj  1:  being  of  the  achromatic  color  of  maximum  lightness;  having 
  little  or  no  hue  owing  to  reflection  of  almost  all 
  incident  light;  "as  white  as  fresh  snow";  "a  bride's 
  white  dress"  [syn:  {white}]  [ant:  {black}] 
  2:  being  of  the  achromatic  color  of  maximum  darkness;  having 
  little  or  no  hue  owing  to  absorption  of  almost  all 
  incident  light;  "black  leather  jackets";  "as  black  as 
  coal";  "rich  black  soil"  [syn:  {black}]  [ant:  {white}] 
  3:  having  no  hue  [syn:  {colorless}]  [ant:  {chromatic}] 




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