1834, in the meaning defined above
New Latin Gadus, genus of fish including the cods (borrowed from Greek gádos "hake, or a similar fish," probably of pre-Greek substratal origin) + -oid entry 2, probably after Gadoidae, former family name
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“Gadoid.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/gadoid. Accessed 25 Oct. 2020.
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