Webster's English Dictionary

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homologous

ho.mol.o.gous \ho--'ma:l-*-g*s, h*-\ aj [Gk homologos agreeing, fr.hom- + 
   legein to say - more at (MLEGEND 1a: having the same relative position, 
   value, or structure  1b1: corresponding in structure or function  1b2: of 
   like genic constitution  1c: belonging to or consisting of a chemical 
   series whose members exhibit  homology 2: derived from or developed in 
   response to organisms of the same species  {~ tissue graft}