Definition of molossus
1 plural molossi \-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
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Origin and Etymology of molossus
Latin, from Greek molossos, from Molossos Molossian
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