1. having the same relation, relative position, or structure.
▪ (of organs) similar in position, structure, and evolutionary origin but not necessarily in function: "a seal's flipper is homologous with the human arm"
▪ (of chromosomes) pairing at meiosis and having the same structural features and pattern of genes.
▪ (of a series of chemical compounds) having the same functional group but differing in composition by a fixed group of atoms.
Word Originmid 17th century: via medieval Latin from Greek homologos ‘agreeing, consistent’, from homos ‘same’ + logos ‘ratio, proportion’.