The Collaborative International Dictionary
Cod liver
Cod liver \Cod" liv`er\, n. The liver of the common cod and allied species.
Cod-liver oil, an oil obtained from the liver of the codfish, and used extensively in medicine as a means of supplying the body with fat in cases of malnutrition.
Usage examples of "cod liver".
Also take 2 gram of vitamin C a day plus cod liver oil capsules as well as four garlic capsules at night before going to bed.
I'll bet that Southworth and Vierecke have discovered what causes cod liver oil to pep people up.