[L. a. Gr. καλλαίς.] A sea-green precious stone; probably turquoise.
1878. Lubbock, Preh. Times, iv. 83. Beads of Callais, a mineral.
1883. N. Joly, Man bef. Metals, II. i. iv. 209. Amber, jet, callaïs, flint, slate … were adopted to make pendants.
