vitrify
verb [ I or T ] uk/ˈvɪt.rɪ.faɪ/ us/ˈvɪt.rɪ.faɪ/
（使）成玻璃，（使）玻璃化;（使）呈玻璃状
to change, or change something, into glass, or into a substance that is like glass, usually with the use of heat
About sixty prehistoric stone forts in Scotland have vitrified walls, where the stone was melted into glass. 在苏格兰，大约有六十座史前石堡有玻璃化墙壁，石头经熔化形成玻璃。