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(wàn)年雪：經(jīng)過(guò)一個(gè)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(lái)源：
German
德語(yǔ)
from German dialectal [of last year]
源自 德語(yǔ)方言 [去年的]
from Old High German firni [old]
源自 古高地德語(yǔ) firni [舊的，老的]