第三紀 [ㄉㄧˋ ㄙㄢ ㄐㄧˋ; di4 san1 ji4] third period tertiary (geological era since the extinction of the dinosaurs at the Cretaceous-Tertiary boundary 65 million years ago) ◄ ►
第三紀 だいさんき noun (common) (futsuumeishi) the Tertiary period ◄ ►