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1. The vault of heaven; the sky.
2. The upper air.
[Middle English welken, from Old English wolcen, weolcen, cloud.]
(Astronomy) archaic the sky, heavens, or upper air
[Old English wolcen, welcen; related to Old Frisian wolken, Old Saxon, Old High German wolcan]
n. Chiefly Literary.
the sky; the vault of heaven.
[before 900; Middle English welken(e), Old English welcn, variant of wolcen cloud, sky]
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|Noun||1.||welkin - the apparent surface of the imaginary sphere on which celestial bodies appear to be projected|
apex of the sun's way, solar apex, apex - the point on the celestial sphere toward which the sun and solar system appear to be moving relative to the fixed stars
celestial point - a point in the heavens (on the celestial sphere)
nadir - the point below the observer that is directly opposite the zenith on the imaginary sphere against which celestial bodies appear to be projected
surface - the extended two-dimensional outer boundary of a three-dimensional object; "they skimmed over the surface of the water"; "a brush small enough to clean every dental surface"; "the sun has no distinct surface"
zenith - the point above the observer that is directly opposite the nadir on the imaginary sphere against which celestial bodies appear to be projected
zodiac - a belt-shaped region in the heavens on either side to the ecliptic; divided into 12 constellations or signs for astrological purposes