I-sōl'o-goŭs, a.

a. [Gr. ἴσος, equal, and λόγος, proportion.] (Chem.) Having similar proportions or relations; — said of groups of homologous terms, in which the radicals, by combining with a series of similar elements, give rise to a series of similar compounds; as, the hydrocarbon group, by its oxide, chloride, alcohol, &c., is isologous with the allyl group, which has also its oxide, chloride, alcohol, and the like. Miller.