Point above which mountains remain white

The Collaborative International Dictionary Word definitions in The Collaborative International Dictionary
Snow \Snow\, n. [OE. snow, snaw, AS. sn[=a]w; akin to D. sneeuw, OS. & OHG. sn[=e]o, G. schnee, Icel. sn[ae]r, snj[=o]r, snaj[=a]r, Sw. sn["o], Dan. snee, Goth. snaiws, Lith. sn["e]gas, Russ. snieg', Ir. & Gael. sneachd, W. nyf, L. nix, nivis, Gr. ...

Longman Dictionary of Contemporary English Word definitions in Longman Dictionary of Contemporary English
noun EXAMPLES FROM CORPUS ▪ The fields around Barnard Castle can be quite green and pleasant, but a few miles further on you meet the snow line .

Wiktionary Word definitions in Wiktionary
alt. 1 The altitude, in a mountainous region, above which the ground is covered with snow, at any particular time. 2 (label en astronomy) the inner limit where volatile molecules can remain frozen in the zone around a star 3 (label en astronomy) by restriction, ...

Wikipedia Word definitions in Wikipedia
The climatic snow line is the point above which snow and ice cover the ground throughout the year. The actual snow line may seasonally be significantly lower.

WordNet Word definitions in WordNet
n. the line on a mountain above which there is perpetual snow and ice