The Collaborative International Dictionary of English v.0.48:

Thirst \Thirst\ (th[~e]rst), n. [OE. thirst, [thorn]urst, AS.
   [thorn]urst, [thorn]yrst; akin to D. dorst, OS. thurst, G.
   durst, Icel. [thorn]orsti, Sw. & Dan. t["o]rst, Goth.
   [thorn]a['u]rstei thirst, [thorn]a['u]rsus dry, withered,
   [thorn]a['u]rsie[thorn] mik I thirst, ga[thorn]a['i]rsan to
   wither, L. torrere to parch, Gr. te`rsesqai to become dry,
   tesai`nein to dry up, Skr. t[.r]sh to thirst. [root]54. Cf.
   Torrid.]
   1. A sensation of dryness in the throat associated with a
      craving for liquids, produced by deprivation of drink, or
      by some other cause (as fear, excitement, etc.) which
      arrests the secretion of the pharyngeal mucous membrane;
      hence, the condition producing this sensation.
      [1913 Webster]

            Wherefore is this that thou hast brought us up out
            of Egypt, to kill us, and our children . . . with
            thirst?                               --Ex. xvii. 3.
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            With thirst, with cold, with hunger so confounded.
                                                  --Chaucer.
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   2. Fig.: A want and eager desire after anything; a craving or
      longing; -- usually with for, of, or after; as, the thirst
      for gold. "Thirst of worldy good." --Fairfax. "The thirst
      I had of knowledge." --Milton.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Thirst \Thirst\, v. t.
   To have a thirst for. [R.]
   [1913 Webster]

         He seeks his keeper's flesh, and thirsts his blood.
                                                  --Prior.
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The Collaborative International Dictionary of English v.0.48:

Thirst \Thirst\, v. t. [imp. & p. p. Thirsted; p. pr. & vb. n.
   Thirsting.] [AS. [thorn]yrstan. See Thirst, n.]
   1. To feel thirst; to experience a painful or uneasy
      sensation of the throat or fauces, as for want of drink.
      [1913 Webster]

            The people thirsted there for water.  --Ex. xvii. 3.
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   2. To have a vehement desire.
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            My soul thirsteth for . . . the living God. --Ps.
                                                  xlii. 2.
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WordNet (r) 3.0 (2006):

thirst
    n 1: a physiological need to drink [syn: thirst,
         thirstiness]
    2: strong desire for something (not food or drink); "a thirst
       for knowledge"; "hunger for affection" [syn: hunger,
       hungriness, thirst, thirstiness]
    v 1: feel the need to drink
    2: have a craving, appetite, or great desire for [syn: crave,
       hunger, thirst, starve, lust]

Moby Thesaurus II by Grady Ward, 1.0:

76 Moby Thesaurus words for "thirst":
   ache, an universal wolf, appetence, appetency, appetite,
   appetition, aridity, aridness, avidity, be ravenous,
   canine appetite, corkiness, covet, coveting, crave, craving,
   desire, drink up, drought, dryness, eagerness, emptiness,
   empty stomach, enthusiasm, eye hungrily, fancy, feel hungry,
   hanker, hanker after, hankering, have a tapeworm, hollow hunger,
   hunger, hunger after, hunger for, hungriness, itch, itching,
   juicelessness, long for, longing, lust, lust after, lust for,
   mania, passion, pine, polydipsia, prurience, pruriency, raven,
   ravenousness, relish, saplessness, sexual desire, soak up,
   sponge up, starve, stomach, sweet tooth, tapeworm, taste,
   thirst for, thirstiness, torment of Tantalus, voraciousness,
   voracity, waterlessness, watertight integrity, watertightness,
   wish, wish for, yearn, yearn for, yearning, yen