The term 'neuter, as a horse' can be summarized by the crossword solution of 'GELD'. Gelding is the process of surgically removing the reproductive organs of a male horse in order to make it unable to reproduce. This procedure is usually done for safety reasons, as ungelded horses are more likely to display aggressive behavior. Gelding is also done to reduce the cost of keeping a horse, as ungelded males require more food and care.