vitrify [vitrified, vitrifying, vitrifies]◼◼◼(to be made into glass) verb [UK: ˈvɪ.trɪ.faɪ] [US: ˈvɪ.trɪ.faɪ]The lightning struck the beach, leaving vitrified sand on the impact site. = La foudre frappa la plage, laissant du sable vitrifié à l'endroit de l'impact.