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Definition of Cthulhu
1. Proper noun. A gigantic fictional humanoid alien god being described with the head of an octopus and dragon wings and claws, around whom an insane cult developed. ¹
2. Adjective. Pertaining to the mythos of Cthulhu and additional otherworldly beings created by H. P. Lovecraft or inspired by his writings and imitators. ¹
¹ Source: wiktionary.com