Gwyllion

Gwyllion or gwyllon is a Welsh word with a wide range of possible meanings including "ghosts, spirits" and "night-wanderers up to no good, outlaws of the wild." Gwyllion is only one of a number of words with these or similar meanings in Welsh. It is a comparatively recent word coined inadvertently in the seventeenth century by the Welsh lexicographer Dr John Davies of Mallwyd.

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