A small flying creature in fantasy role-playing games (particularly D&D), or a variant spelling of archaic/dialectal terms for a ghost or spiritual being.
In fantasy gaming, likely a created word; in historical usage, possibly from Old English 'gast' or related to Germanic ghost terminology. The fantasy usage is modern and independent of any historical etymology.
Gith entered English through fantasy games, showing how modern fiction creates words that become as real in our minds as historical ones!
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