Etymology
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homologous (adj.)

"having the same position, value, structure, etc.," 1650s, from Latinized form of Greek homologos "agreeing, of one mind," from homos "same" (see homo- (1)) + logos "relation, reasoning, computation," related to legein "reckon, select, speak," from PIE root *leg- (1) "to collect, gather," with derivatives meaning "to speak (to 'pick out words')."

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Definitions of homologous

homologous (adj.)
having the same evolutionary origin but not necessarily the same function;
the wing of a bat and the arm of a man are homologous
homologous (adj.)
corresponding or similar in position or structure or function or characteristics; especially derived from an organism of the same species;
a homologous tissue graft
From wordnet.princeton.edu