ice crust; ice rind; ice shell
Refers to a thin, hard layer of ice formed on a surface, such as on snow, water, or an object. Often used in meteorological or descriptive contexts.
An ice crust had formed on the surface of the snow.
A thin ice shell covers the lake.
Compound of 氷 (ひょう, 'ice') and 殻 (かく, 'shell' or 'husk'). The reading is on'yomi, and the term is a straightforward kanji compound.