Definition from Wiktionary, the free dictionary
Alternative forms 
- IPA: /kəˈθuːˌluː/
Proper noun 
- A gigantic fictional humanoid alien god being described with a head resembling an octopus and dragon wings and claws, around whom an insane cult developed.
Derived terms 
a huge fictional humanoid alien god
Cthulhu (not comparable)
- Pertaining to the mythos of Cthulhu and additional otherworldly beings created by H. P. Lovecraft or inspired by his writings and imitators.