hydrologic,a.|haɪdrəʊˈlɒdʒɪk| [f.mod.L. hydrologia(see hydrology) + -ic. Cf. F. hydrologique.] = next. 1887B. E. Fernow in Pop.Sci. Monthly Dec. 226 We..consider the forests..as regulators of hydrologic conditions, influencing the waterflow in springs, brooks, and rivers.