Etymology
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Words related to rheum

*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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rheumatic (adj.)

late 14c., reumatik, "of the nature of, consisting of, or pertaining to rheum," from Old French reumatique (Modern French rhumatique), from Latin rheumaticus (Medieval Latin reumaticus) "troubled with rheum," from Greek rheumatikos, from rheuma "discharge from the body" (see rheum).

By 1738 with the meaning "suffering from rheumatism;" the sense of "pertaining to or caused by rheumatism" is by 1886.

rheumatism (n.)

1680s as a name applied to various similar diseases causing inflammation and pain in the joints, from Late Latin rheumatismus, from Greek rheumatismos, from rheumatizein "suffer from the flux," from rheuma "a discharge from the body" (see rheum). "The meaning of a disease of the joints is first recorded in 1688, because rheumatism was thought to be caused by an excessive flow of rheum into a joint thereby stretching ligaments" [Barnhart].

rheumatoid (adj.)

"resembling rheumatism or its symptoms," 1847, from Greek rheumat-, stem of rheuma "a discharge from the body" (see rheum) + -oid. Rheumatoid arthritis (1859, A.B. Garrod) is a disease of the joints characterized by inflammation and degenerative changes.

rheumatology (n.)

"study of rheumatism and rheumatic diseases," 1949, from Greek rheumat-, stem of rheuma "discharge" (see rheum) + -ology. Related: Rheumatologist.

rheumy (adj.)

1590s, "rheumatic, full of rheum, affected by rheum," from rheum + -y (2).