noun \hō-ˈmäl-ə-jē, hə-\
plural ho·mol·o·gies

Definition of HOMOLOGY

a : likeness in structure between parts of different organisms due to evolutionary differentiation from the same or a corresponding part of a remote ancestor—compare analogy, homomorphy b : correspondence in structure between different parts of the same individual
a : the relation existing between chemical compounds in a series whose successive members have in composition a regular difference especially of one carbon and two hydrogen atoms CH2 b : the relation existing among elements in the same group of the periodic table c : similarity of nucleotide or amino acid sequence (as in nucleic acids or proteins)

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