firn

n.（名詞）
Granular, partially consolidated snow that has passed through one summer melt season but is not yet glacial ice.Also called old snow
粒雪，萬年雪：經(jīng)過一個夏季的溶化期但仍未成冰川的粒狀且部分沉固的雪也作 old snow

來源：
German
德語
from German dialectal [of last year]
源自 德語方言 [去年的]
from Old High German firni [old]
源自 古高地德語 firni [舊的，老的]