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Noun: homolog  'hó-mu,lóg
Usage: US (elsewhere: homologue)
  1. That which is homologous to something else
    "the corresponding sides of similar polygons are the homologs of each other"; "the members of a homologous series in chemistry are the homologs of each other"; "one of the bones in the hand of man is the homolog of that in the paddle of a whale";
    - homologue

Derived forms: homologs

Encyclopedia: Homolog