cod liver oil

noun
🔊/ˌkɒd lɪvər ˈɔɪl/
🔊/ˌkɑːd lɪvər ˈɔɪl/
[uncountable]
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  1. 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