óskabjörn
nafnorðhvorugkynóska-björn
n. [Ivar Aasen fiske-bjorn = fish-bear], a kind of crab, Lat. oniscus; óska-björn is evidently a corruption from the Latin oniscus, which then gave rise to the legend that whosoever possessed the ‘oniscus’ might have a ‘wish’ (ósk) granted.