[a. L. castrātor, f. castrāre.] One who castrates; see the vb.

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1811.  Sporting Mag., XXXVIII. Aug., 211/1. John Beele, castrator, took one testicle away from the horse when it was a year old—the other had not come down into its proper place.

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1818.  Southey, Lett. (1856), III. 93–4. The reviewal of ‘Evelyn’s Memoirs’ (part of which goes to the grand castrator with this letter).

3