Webster's English Dictionary

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homology

ho.mol.o.gy \ho--'ma:l-*-je-, h*-\ n 1: a similarity often attributable to 
   common origin  2a: likeness in structure or function between parts of 
   different organisms  due to evolutionary differentiation from the same or a 
   corresponding part of a remote ancestor 2b: correspondence in structure 
   between different parts of the same individ ual 3a: the relation existing 
   between chemical compounds in a series whose succ essive members have in 
   composition a regular difference esp. of one carbon and two hydrogen atoms 
   CH2 3b: the relation existing among elements in the same group of the 
   periodic  table 4: a classification of configurations in topology into 
   distinct types