I. -ənt adjective
Etymology: Latin effluent-, effluens, present participle of effluere to flow out, from ex- + fluere to flow — more at fluid
Date: 1726
: flowing out : emanating, outgoing
an effluent river
II. noun
Date: 1859
: something that flows out: as
a. : an outflowing branch of a main stream or lake
b. : waste material (as smoke, liquid industrial refuse, or sewage) discharged into the environment especially when serving as a pollutant