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surfaces


  1  definition  found 
 
  From  Webster's  Revised  Unabridged  Dictionary  (1913)  [web1913]: 
 
  Imaginary  \Im*ag"i*na*ry\,  a.  [L.  imaginarius:  cf  F. 
  imaginaire.] 
  Existing  only  in  imagination  or  fancy;  not  real;  fancied; 
  visionary;  ideal. 
 
  Wilt  thou  add  to  all  the  griefs  I  suffer  Imaginary  ills 
  and  fancied  tortures?  --Addison. 
 
  {Imaginary  calculus}  See  under  {Calculus}. 
 
  {Imaginary  expression}  or  {quantity}  (Alg.),  an  algebraic 
  expression  which  involves  the  impossible  operation  of 
  taking  the  square  root  of  a  negative  quantity;  as 
  [root]-9,  a  +  b  [root]-1. 
 
  {Imaginary  points},  {lines},  {surfaces},  etc  (Geom.), 
  points,  lines,  surfaces,  etc.,  imagined  to  exist,  although 
  by  reason  of  certain  changes  of  a  figure  they  have  in  fact 
  ceased  to  have  a  real  existence. 
 
  Syn:  Ideal;  fanciful;  chimerical;  visionary;  fancied;  unreal; 
  illusive. 




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