mo·los·sus \məˈläsəs\noun Etymology: Latin, from Greek molossos, from Molossos Molossian 1.pluralmolos·si\-äˌsī\classical prosody: a foot of three long syllables 2.capitalized[New Latin, from Latin, Molossian, from Greek (kyōn) Molossos, literally, Molossian dog]: a genus of mastiff bats that is the type of the family Molossidae