frost
nounUK /frɒst/
US /frɔːst/
A thin layer of ice that forms on things outside when it is very cold.
When I woke up, the grass was covered in frost.
OTHER MEANINGS
2. A cold period when temperatures drop below freezing, often damaging plants.
The early frost killed the tomato plants in the garden.
3. A dull, white, sugary coating on a cake or pastry.
She spread white frosting on the birthday cake.
4. To cover something with a thin layer of ice or a white coating.
The windows were frosted over after the cold night.