cynodontPronunciation: /ˈsʌɪnə(ʊ)dɒnt/Definition of cynodont noun a fossil carnivorous mammal-like reptile of the late Permian and Triassic periods, with well-developed specialized teeth. Suborder Cynodontia, order Therapsida: several families Origin: late 19th century: from Greek kuōn, kun- 'dog' + odous, odont- 'tooth'cynodont in other Oxford dictionaries Definition of cynodont in the US English dictionary