Dictionary  ho•mol•o•gyPronunciation: (hu-mol'u-jē, hō-), [key] —n., —pl. -gies. 1. the state of being homologous; homologous relation or correspondence. 2. Biol. a. a fundamental similarity based on common descent. b. a structural similarity of two segments of one animal based on a common developmental origin. 3. Chem.the similarity of organic compounds of a series in which each member differs from its adjacent compounds by a fixed increment, as by CH2. 4. Math.a classification of figures according to certain topological properties. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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