Diadema, pe. pro. diadématis, pe. cor. n. g. Cic.A twist or band of white linnen like a little towel foulded, which kinges vsed for their diademe. It is now taken for a kings crowne.Regum diademata.Stat.Imponere diadema.Cic.
Diademâtus, pe. pro. Diademate ornatus: vt Diadematus Apollo. Plin. Wearing a diademe or crowne.Diadocos.A stone like berril.
Lewis and Short: Latin dictionary
dĭădēma, ătis, n. (diadēma, ae, f., Pompon. ap. Prisc. p. 679 P. [Com. v. 163 Rib.]; Ap. M. 10, p. 253, 10), = dia/dhma, a royal head-dress, a diadem (for syn. cf.: infula, vitta, redimiculum), Cic. Phil. 2, 34, 85; 3, 5, 12; Quint. 9, 3, 61; Suet. Caes. 79; Hor. C. 2, 2, 21; Juv. 8, 259; Vulg. Apoc. 12, 3 al.