Cod LIVER oil is a nutritional supplement made from the LIVER of cod fish. It is rich in vitamins A and D, as well as omega-3 fatty acids. The crossword solutions for the term 'cod LIVER oil' are onions (6 letters), ORGAN (5 letters), and foie (4 letters). Onions are a type of vegetable that are often used in cooking and have a strong flavor. ORGAN is a general term for any part of an organism that performs a specific function. Foie is a French word meaning 'LIVER, ' which is the ORGAN from which cod LIVER oil is derived.