English This entry needs a photograph or drawing for illustration. Please try to find a suitable image on Wikimedia Commons or upload one there yourself! Noun sea otter's cabbage (uncountable) A kelp, of species Nereocystis luetkeana, that forms very large beds in which sea otters make their homes, of the north Pacific. Synonyms (kelp): bladder kelp References Nereocystis on Wikipedia.Wikipedia Nereocystis luetkeana on Wikispecies.Wikispecies Nereocystis luetkeana on Wikimedia Commons.Wikimedia Commons Wikiwand - on Seamless Wikipedia browsing. On steroids.