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1. (biology) having the same evolutionary origin but not necessarily the same function
   "the wing of a bat and the arm of a man are homologous"
    
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"

See also: homologic, homological

Antonym: analogous, autologous, heterologous

Encyclopedia: Homologous