(historical) A lamp placed below the oil tube of an Argand lamp to keep the oil limpid on cold nights; used especially in lighthouses.

Cold so intense as to freeze vegetation and turn it black, without the formation of hoarfrost.

An upwards swelling of soil during freezing conditions caused by an increasing presence of ice as it grows towards the surface, upwards from the depth in the soil where freezing temperatures have penetrated into the soil.

plural of frost-bearer

cryophorus

The depth to which the water present in the soil is expected to freeze in winter. / The depth to which the water present in the soil is actually frozen in a given place at a given point in time.

Vitis vulpina / Vitis riparia

(horticulture) Of plants: unable to tolerate frost, and liable to die if exposed to it.

(of a surface) that has been affected by the freeze-thaw cycle

plural of degree of frost