Webster's Revised Unabridged Dictionary · 1913

Reflux

Reflux (r?"fl?ks`) , adjective

Returning, or flowing back; reflex; as, reflux action.

Reflux , noun

[French reflux. See Refluent, Flux.]

A flowing back, as the return of a fluid; ebb; reaction; as, the flux and reflux of the tides.
All from me Shall with a fierce reflux on me redound. — Milton