placoid
adjective
plac·oid
ˈpla-ˌkȯid 
: of, relating to, or being a scale of dermal origin with an enamel-tipped spine characteristic of the elasmobranchs
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“Placoid.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/placoid. Accessed 16 May. 2025.
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