anal·o·gy ə-'nal-ə-jē n, pl -gies functional similarity between anatomical parts without similarity of structure and origin compare HOMOLOGY (1)
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anal·o·gy (ə-nalґə-je) [Gr. analogia equality of ratios, proportion] the quality of being analogous; resemblance or similarity in function or appearance, but not in origin or development.Medical dictionary. 2011.