from The American Heritage® Dictionary of the English Language, 4th Edition
- n. Granular, partially consolidated snow that has passed through one summer melt season but is not yet glacial ice. Also called old snow.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. A type of old snow which has gone through multiple thaw and refreeze cycles and thus is made of numerous small icy grains, though it is not nearly as saturated with water as snow-cone slush is; can be hard or somewhat soft depending on recent and current weather conditions.
from The Century Dictionary and Cyclopedia
- n. A name given to snow accumulated in the highest parts of mountain ranges on which glaciers occur, while such snow is in a granular condition, and before, in its downward movement, it has been fully consolidated into ice.
German, from German dialectal, of last year, from Old High German firni, old.(American Heritage® Dictionary of the English Language, Fourth Edition)