Something that flows out or forth, especially: a. A stream flowing out of a body of water. b. An outflow from a sewer or sewage system. c. A discharge of liquid waste, as from a factory or nuclear plant.
ETYMOLOGY:
Middle English, from Latin effluns, effluent-, present participle of effluere, to flow out : ex-, ex- + fluere, to flow; see bhleu- in Appendix I.