Homologue hais txog cov organic tebchaw nrog cov qauv zoo sib xws thiab sib txawv molecular muaj pes tsawg leeg los ntawm ntau pawg "CH2" atomic; Feem ntau tshwm sim nyob rau hauv cov organic chemistry, thiab yuav tsum yog tib chav kawm ntawm cov khoom (muaj tib yam thiab sib npaug ntawm cov pab pawg ua haujlwm, tshwj tsis yog rau pawg hydroxyl, phenols thiab cawv tsis tuaj yeem yog homologous compounds xws li phenol thiab benzyl cawv).
