Neutering, from the Latin neuter (of neither sex), is the removal of an animal's reproductive organ, either all of it or a considerably large part. "Neutering" is often used incorrectly to refer only to male animals but the term actually applies to both sexes. The male-specific term is castrating while spaying is usually reserved for female animals. Colloquially, both terms are often referred to as fixing. In male horses, castrating is referred to as gelding.