di·phy·odont I. \(ˈ)dī|fiəˌdänt\adjective Etymology: International Scientific Vocabulary diphy- + -odont : having deciduous and permanent sets of teeth successively < a diphyodont mammal > also: marked by the development of two such sets < diphyodont dentition > — opposed to monophyodont II. noun (-s) : a diphyodont animal < most mammals are diphyodonts >