Etymology
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Words related to stream

*sreu- 

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

It forms all or part of: amenorrhea; catarrh; diarrhea; gonorrhea; hemorrhoids; maelstrom; rheo-; rheology; rheostat; rheum; rheumatic; rheumatism; rheumatoid; rhinorrhea; rhythm; seborrhea; stream.

It is the hypothetical source of/evidence for its existence is provided by: Sanskrit sravati "flows," srotah "stream;" Avestan thraotah- "stream, river," Old Persian rauta "river;" Greek rhein "to flow," rheos "a flowing, stream," rhythmos "rhythm," rhytos "fluid, liquid;" Old Irish sruaim, Irish sruth "stream, river;" Welsh ffrwd "stream;" Old Norse straumr, Old English stream; Lettish strauma "stream, river;" Lithuanian sravėti "to trickle, ooze;" Old Church Slavonic struja "river," o-strovu "island," literally "that which is surrounded by a river;" Polish strumień "brook."

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blood-stream (n.)
also bloodstream, 1847, from blood (n.) + stream (n.).
downstream (adv.)

"with or in the direction of the current of a stream," 1706, from the prepositional phrase; see down (adv.) + stream (n.). As an adjective by 1842. Middle English had the prepositional phrase down the water (c. 1400).

mainstream (n.)
also main-stream, main stream, "principal current of a river," 1660s, from main (adj.) + stream (n.); hence, "prevailing direction in opinion, popular taste, etc.," a figurative use first attested in Carlyle (1831). Mainstream media attested by 1980 in language of U.S. leftists critical of coverage of national affairs.
midstream (n.)

also mid-stream, "the middle of the stream," Old English midstream; see mid (adj.) + stream (n.).

millstream (n.)

"a mill-race, a current of water that drives a mill-wheel," Old English mylestream; see mill (n.1) + stream (n.).

slipstream (n.)
also slip-stream, 1913, from slip (n.2) + stream (n.).
streamline (n.)
1868, "line drawn from point to point, so that its direction is everywhere that of the motion of the fluid" [Lamb, "Hydrodynamics," 1906], from stream (n.) + line (n.). The adjective is attested from 1898, "free from turbulence," 1907 in sense of "shaped so that the flow around it is smooth."
upstream (adv.)
also up-stream, 1680s, from up (adv.) + stream (n.). As an adjective from 1838.
instreaming (adj.)

1855, from in (adv.) + streaming (see stream (v.)). As a noun from 1876.