2  definitions  found 
 
  From  Webster's  Revised  Unabridged  Dictionary  (1913)  [web1913]: 
 
  Homologous  \Ho*mol"o*gous\,  a.  [Gr.  ?  assenting,  agreeing;  ?  the 
  same  +  ?  speech,  discourse,  proportion,  ?  to  say  speak.] 
  Having  the  same  relative  position,  proportion,  value,  or 
  structure.  Especially: 
  a  (Geom.)  Corresponding  in  relative  position  and 
  proportion. 
 
  In  similar  polygons,  the  corresponding  sides, 
  angles,  diagonals,  etc.,  are  homologous.  --Davies  & 
  Peck  (Math. 
  Dict.). 
  b  (Alg.)  Having  the  same  relative  proportion  or  value,  as 
  the  two  antecedents  or  the  two  consequents  of  a 
  proportion. 
  c  (Chem.)  Characterized  by  homology;  belonging  to  the  same 
  type  or  series;  corresponding  in  composition  and 
  properties.  See  {Homology},  3. 
  d  (Biol.)  Being  of  the  same  typical  structure;  having  like 
  relations  to  a  fundamental  type  to  structure;  as  those 
  bones  in  the  hand  of  man  and  the  fore  foot  of  a  horse  are 
  homologous  that  correspond  in  their  structural  relations, 
  that  is  in  their  relations  to  the  type  structure  of  the 
  fore  limb  in  vertebrates. 
 
  {Homologous  stimulus}.  (Physiol.)  See  under  {Stimulus}. 
 
  From  WordNet  r  1.6  [wn]: 
 
  homologous 
  adj  1:  (biology)  having  the  same  evolutionary  origin  but  serving 
  different  functions;  "the  wing  of  a  bat  and  the  arm  of 
  a  man  are  homologous"  [ant:  {analogous},  {heterologous}] 
  2:  corresponding  or  similar  in  position  or  structure  or 
  function  or  characteristics;  especially  derived  from  an 
  organism  of  the  same  species;  "a  homologous  tissue  graft" 
  [ant:  {heterologous},  {autologous}] 

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