noun
medium-sized blackish-grey seal with large inflatable sac on the head; of Arctic and northern Atlantic waters
• Syn: ↑bladdernose, ↑Cystophora cristata
• Hypernyms: ↑earless seal, ↑true seal, ↑hair seal
• Member Holonyms: ↑Cystophora, ↑genus Cystophora
Useful english dictionary. 2012.