HNYKILLnafnorðkarlkynm., dat. hnykli, [Dan. nögle; Swed. nyckel; prob. a dimin. derived from hnoða]:—a clew of yarn: metaph. a clew-like thing; þoku-hnyklar, ský-h., wreaths of fog and clouds: of a tumor, Fas. ii. 453.