Etymology
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Words related to flow

*pleu- 
Proto-Indo-European root meaning "to flow."

It forms all or part of: fletcher; fledge; flee; fleet (adj.) "swift;" fleet (n.2) "group of ships under one command;" fleet (v.) "to float, drift; flow, run;" fleeting; flight (n.1) "act of flying;" flight (n.2) "act of fleeing;" flit; float; flood; flotsam; flotilla; flow; flue; flugelhorn; fluster; flutter; fly (v.1) "move through the air with wings;" fly (n.) "winged insect;" fowl; plover; Pluto; plutocracy; pluvial; pneumo-; pneumonia; pneumonic; pulmonary.

It is the hypothetical source of/evidence for its existence is provided by: Sanskrit plavate "navigates, swims;" Greek plynein "to wash," plein "to navigate," ploein "to float, swim," plotos "floating, navigable," pyelos "trough, basin;" Latin plovere "to rain," pluvius "rainy;" Armenian luanam "I wash;" Old English flowan "to flow;" Old Church Slavonic plovo "to flow, navigate;" Lithuanian pilu, pilti "to pour out," plauju, plauti "to swim, rinse."
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inflow (n.)

"act of flowing in or into; that which flows in, influx," 1839, from in (adj.) + flow (n.).

interflow (n.)
"a flowing into each other," 1839, from inter- + flow (n.).
outflow (n.)

1869, "act or fact of flowing out, a flowing out or forth;" 1875, "that which flows out," from out- + flow (n.).

workflow (n.)
1949, from work (n.) + flow (n.).
flood (n.)
Old English flōd "a flowing of water, tide, an overflowing of land by water, a deluge, Noah's Flood; mass of water, river, sea, wave," from Proto-Germanic *floduz "flowing water, deluge" (source also of Old Frisian flod, Old Norse floð, Middle Dutch vloet, Dutch vloed, German Flut, Gothic flodus), from suffixed form of PIE verbal root *pleu- "to flow" (also the source of flow). In early modern English often floud. Figurative use, "a great quantity, a sudden abundance," by mid-14c.
flown 
past participle of fly (v.), from Middle English flogen, flowen. Also formerly the past participle of flow (v.).
flue (n.)

"smoke channel in a chimney," 1580s, of uncertain origin, perhaps related to Middle English flue, flewe "mouthpiece of a hunting horn" (early 15c.), which is perhaps from Old French fluie "stream;" or the modern word is perhaps from Middle Dutch vluwe, from Germanic *flowan "to flow" (see flow (v.)). Originally a small chimney in a furnace connected to the main chimney.

overflow (v.)

Middle English overflouen, from Old English oferfleow "to flow across, flood, inundate," also "to flow over (a brim or bank);" see over- + flow (v.). Common Germanic (Old High German ubarfliozan, German überfliessen, etc.). Related: Overflowed; overflowing.