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/fɪə(ɹ)n/ · noun
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 snowcone slush is; can be hard or somewhat soft depending on recent and current weather conditions..
Use firn when its meaning, tone and grammar fit the full sentence. A synonym is not always a direct replacement.
Firn means 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 snowcone slush is; can be hard or somewhat soft depending on recent and current weather conditions..
Common synonyms include névé.
The opposite depends on the specific sense.
Use firn where its definition matches the intended context.
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