efflŭvĭum, ii, n. [effluo],
a flowing out , an outlet (post-Aug. and very rare): umoris e corpore, Plin. 7, 51, 52, § 171: lacus, Tac. A. 12, 57: cerebri effluvio exspirare, Vell. 2, 120 fin. , v. Kritz. ad h. l.
effluvium ī, n effluo, an outlet : lacūs, Ta. ...
An Elementary Latin Dictionary
·adj Subtile or invisible emanation; exhalation perceived by the sense of smell; especially, noisome...
Webster's Dictionary of the English Language