2 [rash]
an eruption or efflorescence on the skin.
a multitude of instances of something occurring more or less during the same period of time: a rash of robberies last month.

1700–10; < French rache (obsolete), Old French rasche skin eruption, derivative of raschier to scratch, ultimately < Latin rādere to scratch

rashlike, adjective
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World English Dictionary
rash1 (ræʃ)
1.  acting without due consideration or thought; impetuous
2.  characterized by or resulting from excessive haste or impetuosity: a rash word
[C14: from Old High German rasc hurried, clever; related to Old Norse roskr brave]

rash2 (ræʃ)
1.  pathol any skin eruption
2.  a series of unpleasant and unexpected occurrences: a rash of forest fires
[C18: from Old French rasche, from raschier to scratch, from Latin rādere to scrape]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

c.1300, "nimble, quick, vigorous," a Scottish and northern word, perhaps from O.E. -ræsc (cf. ligræsc "flash of lightning"), from P.Gmc. *raskuz (cf. M.L.G. rasch, M.Du. rasc "quick, swift," Ger. rasch "quick, fast"). Related to O.E. horsc "quick-witted." Sense of "reckless, impetuous, heedless
of consequences" is attested from 1509.

"red spots on skin," 1709, perhaps from Fr. rache "a sore," from O.Fr. rache "ringworm," from V.L. *rasicare "to scrape" (cf. O.Prov. rascar, Sp. rascar "to scrape, scratch," It. raschina "itch"), from L. rasus "scraped," pp. of radere "to scrape" (see raze). The connecting
notion is of itching. Sense of "any sudden outbreak or proliferation" first recorded 1820.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

rash (rāsh)
A skin eruption.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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