welkin

名词 welkin:

1. the apparent surface of the imaginary sphere on which celestial bodies appear to be projected
   同义词：celestial sphere, sphere, empyrean, firmament, heavens, vault of heaven

wel.kin

n.（名词）
The vault of heaven; the sky.
苍穹；天空
The upper air.
高层空气

来源：
Middle English welken
中古英语 welken
from Old English wolcen, weolcen [cloud]
源自 古英语 wolcen, weolcen [云]