Simian is an adjective or noun relating to or resembling monkeys or apes. For example, you might describe something as simian if it is monkey- or ape-like. Synonyms of simian include anthropoid, chimpanzee, gorilla, and monkey. The word simian comes from the Latin simia, which means "ape". The word simus means "snub-nosed" and comes from the Greek word simos. The word simos is also a masculine proper name. Simian can also refer to the suborder of primates that includes monkeys, apes, and humans. This suborder is called Anthropoidea.