[Greek ὀδοντ- tooth] having two distinct sets of teeth; consisting (as teeth) of two sets: as in the deciduous and permanent teeth of mammals; as n. a diphyodont mammal.
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1854 R. Owen in Circle of Sci. (c1865) II. 100/1 The diphyodonts..generate two sets of teeth.
1854 R. Owen in Circle of Sci. (c1865) II. 100/1 The diphyodont mammalia.
1883 W. Flower in Glasgow Weekly Herald 14 July 8/1 Teeth..of the simple homodont and diphyodont type.