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

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• Wordscraper
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adj. Of or pertaining to cosmogony.

Of or pertaining to cosmogony.

adj. pertaining to the branch of astronomy dealing with the origin and history and structure and dynamics of the universe

"The cosmogonic myth of Bone is laid out on three occasions."

cosmogonically    cosmogonical   

aetiological    unskillfully    epick    critics.i    Orphic