Source : Webster's Revised Unabridged Dictionary (1913)

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["a]lla, and cf. AS. gilte a young sow, OHG. galt
   dry, not giving milk, G. gelt, Goth. gilpa siclke.]
   1. To castrate; to emasculate.

   2. To deprive of anything essential.

            Bereft and gelded of his patrimony.   --Shak.

   3. To deprive of anything exceptionable; as, to geld a book,
      or a story; to expurgate. [Obs.] --Dryden.

Gelding \Geld"ing\, n. [Icel. gelding a gelding, akin to
   geldingr wether, eunuch, Sw. g["a]lling gelding, Dan. gilding
   eunuch. See {Geld}, v. t.]
   A castrated animal; -- usually applied to a horse, but
   formerly used also of the human male.

         They went down both into the water, Philip and the
         gelding, and Philip baptized him.        --Wyclif (Acts
                                                  viii. 38).

Gelding \Geld"ing\, p. pr. a. & vb. n.
   from {Geld}, v. t.

Source : WordNet®

gelding
     n : castrated male horse