manta Syllabification: (man·ta)Pronunciation: /ˈmantə/Definition of manta noun 1 (also manta ray) a devil ray that occurs in all tropical seas and may reach very great size. It is sometimes seen leaping high out of the water. Manta birostris, family Mobulidae 2a rough-textured cotton fabric made and used in Spanish America. a shawl made of manta. Origin: late 17th century: from Latin American Spanish, literally 'large blanket'manta in other Oxford dictionaries Definition of manta in the British & World English dictionary