The Collaborative International Dictionary of English v.0.48:
neutered \neutered\ adj. Deprived of sexual capacity or sexual attributes. Syn: altered, castrated, unsexed, fixed, apayed, desexed. [WordNet 1.5]WordNet (r) 3.0 (2006):
neutered adj 1: having testicles or ovaries removed [syn: altered, neutered]