neuter
US /ˈnuː.t̬ɚ/
UK /ˈnuː.t̬ɚ/

1.
a gender that is neither masculine nor feminine
:
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In some languages, inanimate objects are assigned a neuter gender.
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The word 'it' is a neuter pronoun.
2.
an animal that has been spayed or castrated
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The vet recommended that we neuter our male cat to prevent unwanted litters.
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Many animal shelters require pets to be neuter before adoption.
1.
a castrated or spayed animal
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The shelter has many healthy neuters ready for adoption.
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They adopted a neuter from the local animal shelter.