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thirst

[thurst]
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noun
  1. a sensation of dryness in the mouth and throat caused by need of liquid.
  2. the physical condition resulting from this need, in any of various degrees: They almost died of thirst.
  3. strong or eager desire; craving: a thirst for knowledge.
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verb (used without object)
  1. to feel thirst; be thirsty.
  2. to have a strong desire.
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Origin of thirst

before 900; Middle English thirsten (v.), Old English thyrstan, derivative of thurst (noun); cognate with Dutch dorst, German Durst, Old Norse thorsti, Gothic thaurstei; noun has -i- from the v. or from thirsty; see toast1
Related formsthirst·er, nounun·thirst·ing, adjective
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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British Dictionary definitions for thirst

thirst

noun
  1. a craving to drink, accompanied by a feeling of dryness in the mouth and throat
  2. an eager longing, craving, or yearninga thirst for knowledge
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verb
  1. (intr) to feel a thirstto thirst for a drink; to thirst after righteousness
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Word Origin

Old English thyrstan, from thurst thirst; related to Old Norse thyrsta to thirst, Old High German dursten to thirst, Latin torrēre to parch
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for thirst

n.

Old English þurst, from West Germanic *thurstus (cf. Old Saxon thurst, Frisian torst, Dutch dorst, Old High German and German durst), from Proto-Germanic *thurs-, from PIE root *ters- "dry" (see terrain). Figurative sense of "vehement desire" is attested from c.1200.

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v.

Old English þyrstan (see thirst (n.)); the figurative sense of the verb was present in Old English. Related: Thirsted; thirsting.

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Online Etymology Dictionary, © 2010 Douglas Harper

thirst in Medicine

thirst

(thûrst)
n.
  1. A sensation of dryness in the mouth and throat related to a need or desire to drink.
  2. The desire or need to drink.
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v.
  1. To feel a need to drink.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.