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orthomore about ortho

ortho


  1  definition  found 
 
  From  Webster's  Revised  Unabridged  Dictionary  (1913)  [web1913]: 
 
  Ortho-  \Or"tho-\  [Gr.  ?  straight;  akin  to  Skr.  ?rdhva  upright, 
  vrdh  to  grow,  to  cause  to  grow.] 
  1.  A  combining  form  signifying  straight,  right  upright, 
  correct,  regular;  as  orthodromy,  orthodiagonal,  orthodox, 
  orthographic. 
 
  2.  (Chem.)  A  combining  form  (also  used  adjectively), 
  designating: 
  a  (Inorganic  Chem.)  The  one  of  several  acids  of  the  same 
  element  (as  the  phosphoric  acids),  which  actually 
  occurs  with  the  greatest  number  of  hydroxyl  groups; 
  as  orthophosphoric  acid.  Cf  {Normal}. 
  b  (Organic  Chem.)  Connection  with  or  affinity  to  one 
  variety  of  isomerism,  characteristic  of  the  benzene 
  compounds;  --  contrasted  with  {meta-}  or  {para-};  as 
  the  ortho  position;  hence  designating  any  substance 
  showing  such  isomerism;  as  an  ortho  compound. 
 
  Note:  In  the  graphic  representation  of  the  benzene  nucleus 
  (see  {Benzene  nucleus},  under  {Benzene}),  provisionally 
  adopted,  any  substance  exhibiting  double  substitution 
  in  adjacent  and  contiguous  carbon  atoms,  as  1  &  2,  3  & 
  4,  4  &  5,  etc.,  is  designated  by  ortho-;  as 
  orthoxylene;  any  substance  exhibiting  substitution  of 
  two  carbon  atoms  with  one  intervening,  as  1  &  3,  2  &  4, 
  3  &  5,  4  &  6,  etc.,  by  meta-;  as  resorcin  or 
  metaxylene;  any  substance  exhibiting  substitution  in 
  opposite  parts  as  1  &  4,  2  &  5,  3  &  6,  by  para-;  as 
  hydroquinone  or  paraxylene. 




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