This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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adj. Celestial; heavenly.

adj. Of, coming from, or being in the sky or high above.

adj. Pertaining to heaven or to the sky; celestial.

adj. Exalted, exquisite, superlative.

adj. Being in a higher place or region; locally higher.

adj. Relating or belonging to things above; celestial; heavenly.

Being in a higher or upper place; situated above: as, supernal regions.

Relating to things above; celestial; heavenly.

In zoology, superior in position; situated high up: as, the supernal nostrils of a bird.

adj. being or coming from on high

adj. of heaven or the spirit

"We call the supernal lights fixed, yet they wander about yonder plain, and if"

heavenly   

celestial    heavenly    higher   

fadeless    sourceless    serener    heav'nly    roseate    graft-versus-host    full-orbed    over-populated    lambent    eye-searing