χῐον-ίζω · chion-izō — LSJ
snow upon, cover with snow: impers., εἰ ἐχιόνιζε . . τὴν χώρην [sc. ὁ θεός] Hdt. 2.22: abs., εἰ ἐχιόνιζε if it snowed, ibid.:—Pass., to be covered with snow, D.S. 1.39, Sm. Ps. 67(68).15, Dsc. 4.61, D.L. 6.23 (v.l. κεχιονωμένους), Sch. A.R. 4.269.
turn into snow, in Pass., PMag. 13.299 Preisendanz; make snow-white, Hsch.