Obs. Forms: α. 4 cassidoin, casydoyn, 7 cassidoin(e; β. 5 cassedon(ne, 5–6 cassidon, 6 cassaydown, cassa-, cassidone, -en; γ. 7 cassidonie, 8 cassidony; δ. 6 casyldon, cassilden. [a. OF. cassidoine, a semi-popular form of calcidoine, calcedoine, ad. L. chalcedōnius (lapis) a stone of Chalcedon: see CHALCEDONY.
a. 1300. Floriz & Bl., 286. Suþþe riche cassidoines, And Jacinctes and topaces.
c. 1325. E. E. Allit. P., B. 1421. Casydoynes, & crysolytes, & clere rubies.
1488. Inv. Jas. III., in Tytler, Hist. Scot. (1864), II. 392/1. A collar of cassedonis.
1500. Inv., in Ann. Reg. (1768), 135. A pair of beads ten stones, cassidens.
1503. Will of Both (Somerset Ho.). A peyre of bedes of Casyldon.
c. 1530. in Gutch, Coll. Cur., II. 297. A garnysshing for a Salte for a Cassadone.
1534. in Eng. Ch. Furniture (1866), 195. Item x bedes of lambre & ij cassildens with a stryng of silk.
1548. Will of Dame M. Kingston (Somerset Ho.). A paire of beades of Cassaydown.
1601. Holland, Pliny, II. 454. We digged into the same earth for Cassidonie and Crystall. Ibid., 605. In these crystals as well as in Cassidoins.
1611. Cotgr., Cassidonie, a cassidonie; a base, and brittle stone, of small value, though it shine like fire.
1753. Chambers, Cycl. Supp., Cassidony, a name given by the Italians and Germans to a sort of beads made of the yellow and red chalcedony.
attrib. 1601. Holland, Pliny, II. 603. These rich Cassidoine vessels [called in Latine Murrhina] from out of the Leuant.
