LATIN DICTIONARYLexicon Latīnum
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“efflux” in Latin

The English word efflux itself goes back to Latin fluō, through effluxus.

Riddle & Arnold A Copious and Critical English–Latin Lexicon, 1864

efflux
Act of flowing forth, fluxio (Cic.): effluvium: profluvium.
Effusion, effusio (e.g. animi in laetitia, Cic.; hence “efflux of piety” [Hammond], *pii animi or sensus effusio).
That which flows forth, id, quod ab aliqua re manat et fluit; id, quod ex aliqua re effluit. Vid: EFFLUENCE.

Quick answer

What is the Latin word for efflux?
The usual Latin words for “efflux” are effluvium, prōfluvium, effūsiō. The right choice depends on the sense; see the distinctions below.

Entry from J. E. Riddle & T. K. Arnold, A Copious and Critical English–Latin Lexicon (rev. C. Anthon, New York: Harper, 1864), digitised by Fergus J. P. Walsh, CC BY-SA 4.0; Latin markup adapted by latindictionary.co.