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slate-pencil sea urchin

noun
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Definition of slate-pencil sea urchin

: a large purple sea urchin (Heterocentrotus mammillatus) having stout heavy spines that resemble slate pencils

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“Slate-pencil sea urchin.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/slate-pencil%20sea%20urchin. Accessed 29 Sep. 2020.

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