See cod-liver oil for more cod liver oilBrE /ˌkɒd lɪvər ˈɔɪl/ 🔊NAmE /ˌkɑːd lɪvər ˈɔɪl/ 🔊 noun [uncountable] a thick yellow oil from the liver of cod (= a type of fish), containing a lot of vitamins A and D and often given as a medicine 鱼肝油