The Collaborative International Dictionary of English v.0.48:

Geld \Geld\, v. t. [imp. & p. p. Gelded or Gelt (?); p. pr. &
   vb. n. Gelding.] [Icel. gelda to castrate; akin to Dan.
   gilde, Sw. g[aum]lla, and cf. AS. gilte a young sow, OHG.
   galt dry, not giving milk, G. gelt, Goth. gilpa siclke.]
   1. To castrate; to emasculate.
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   2. To deprive of anything essential.
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            Bereft and gelded of his patrimony.   --Shak.
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   3. To deprive of anything exceptionable; as, to geld a book,
      or a story; to expurgate. [Obs.] --Dryden.
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WordNet (r) 3.0 (2006):

gelded
    adj 1: (of a male animal) having the testicles removed; "a cut
           horse" [syn: cut, emasculated, gelded]

Moby Thesaurus II by Grady Ward, 1.0:

59 Moby Thesaurus words for "gelded":
   acarpous, arid, barren, castrated, celibate, childless,
   debilitated, demasculinized, desert, desolate, devitalized,
   drained, dried-up, dry, effeminized, emasculate, emasculated,
   enervated, eunuchized, exhausted, fallow, fruitless, gaunt,
   impotent, ineffectual, infecund, infertile, issueless, jejune,
   leached, lustless, marrowless, menopausal, nerveless, nonfertile,
   nonproducing, nonproductive, nonprolific, pithless, sine prole,
   sinewless, sterile, sucked dry, teemless, uncultivated, unfertile,
   unfruitful, unmanned, unnerved, unplowed, unproductive, unprolific,
   unsexed, unsown, untilled, virgin, waste, wasted, without issue