cod liver oil

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun A nutritional supplement derived from the liver of cod fish which has high levels of omega-3 fatty acids, EPA and DHA, and very high levels of vitamin A and vitamin D.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun an oil obtained from the livers of cod and similar fishes; taken orally as a source of vitamins A and D