gadoidPronunciation: /ˈgeɪdɔɪd, ˈga-/Definition of gadoid noun Zoology a bony fish of an order (Gadiformes) that comprises the cods, hakes, and their relatives. adjective relating to or denoting the gadoids. Origin: mid 19th century: from modern Latin gadus (from Greek gados 'cod') + -oidgadoid in other Oxford dictionaries Definition of gadoid in the US English dictionary