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opercular bones

plural noun
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Definition of opercular bones

: the bony plates developed in and supporting the gill cover in most fishes and being usually the opercle, preopercle, subopercle, and interopercle

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“Opercular bones.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/opercular%20bones. Accessed 6 Mar. 2021.

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