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  1  definition  found 
  From  Webster's  Revised  Unabridged  Dictionary  (1913)  [web1913]: 
  Heterology  \Het`er*ol"o*gy\,  n.  [Hetero-  +  -logy.] 
  1.  (Biol.)  The  absence  of  correspondence,  or  relation,  in 
  type  of  structure;  lack  of  analogy  between  parts  owing  to 
  their  being  composed  of  different  elements,  or  of  like 
  elements  in  different  proportions;  variation  in  structure 
  from  the  normal  form  --  opposed  to  homology. 
  2.  (Chem.)  The  connection  or  relation  of  bodies  which  have 
  partial  identity  of  composition,  but  different 
  characteristics  and  properties;  the  relation  existing 
  between  derivatives  of  the  same  substance,  or  of  the 
  analogous  members  of  different  series;  as  ethane,  ethyl 
  alcohol,  acetic  aldehyde,  and  acetic  acid  are  in 
  heterology  with  each  other  though  each  in  at  the  same 
  time  a  member  of  a  distinct  homologous  series.  Cf