† chalceˈdonian,n.1Obs. Also cal-. [f. L. chalcedoni-us chalcedony + -an.] = chalcedony. 1622–62Heylin Cosmogr. ii. (1682) 54 Chalcedonians also of such bigness, that whole Drinking-cups are made of them.1750tr.Leonardus' Mirr. Stones 801 The Calcedonian pale white, and also the hardest dun.