名詞 welkin:

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

wel.kin

n.（名詞）
The vault of heaven; the sky.
蒼穹；天空
The upper air.
高層空氣

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