Last Updated:2025/11/29
Any of numerous clypeastroid sea urchins (sand dollars) of the genera Melitta, Rotula and Encope, with one or more perforations resembling keyholes.
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keyhole urchin
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Source Word
keyhole urchin
Noun
Japanese Meaning
鍵穴ウニ:Melitta属、Rotula属、Encope属に属し、平らな体に鍵穴のような穴が一つ以上ある海ウニ(砂ドル)の総称。
( plural )