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Definition of Homologous series
1. Noun. (chemistry) any series of aliphatic organic compounds whose members differ only in the addition of a CH2 group; for example, the carboxylic acids, CH3(CH2)nCOOH where n is any non-negative number ¹
¹ Source: wiktionary.com
Medical Definition of Homologous series
1. A series of organic compounds, the succeeding members of which differ from each other by the radical CH2 (as in the fatty series). (05 Mar 2000)