Anoestrous is a term used to describe a period of time when a female animal is not experiencing estrus or is not in a reproductive state. There are a few synonyms for this term, including anestrus, non-estrous, and acyclic. All of these synonyms convey the same basic meaning that the animal is not in a state of reproductive readiness. Anoestrous is a common physiological process in many species, including cattle, horses, and sheep, and it is a useful term for veterinarians and animal scientists to describe changes in reproductive status in these animals. Overall, understanding the synonyms for anoestrous can help individuals better communicate about animal reproductive health and behavior.