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reflux (n.)

early 15c., "a flowing back" (of the sea, etc.), "ebb tide," also figurative of instability, from Medieval Latin refluxus, from Latin re- "back, again" (see re-) + fluxus "a flowing," from fluere "to flow" (see fluent). Digestive sense is recorded from 1937; reflux-valve is attested by 1853.

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Definitions of reflux from WordNet

reflux (n.)
an abnormal backward flow of body fluids;
reflux (n.)
the outward flow of the tide;
Synonyms: ebb
From wordnet.princeton.edu