Decades: 590s - 600s - 610s - 620s - 630s - 640s - 650s - 660s - 670s - 680s - 690s
Years: 640 641 642 643 644 645 646 647 648 649 650
... palate[?]) (c, ch, j, jh, ~n) Retroflex[?] (roughly the place of articulation of English alveolars like t, but with the tongue curled back) (t, th, d, dh, n) Dental ...