a. [ Gr. &unr_; double (di- = di`s- twice + &unr_; to produce) + 'odoy`s, 'odo`ntos, tooth. ] (Anat.) Having two successive sets of teeth (deciduous and permanent), one succeeding the other; as, a diphyodont mammal; diphyodont dentition; -- opposed to monophyodont. -- n. An animal having two successive sets of teeth. [ 1913 Webster ]