Meanings
nounkeyhole urchin (plural keyhole urchins)
plural keyhole urchins
- Any of numerous clypeastroid sea urchins (sand dollars) of the genus Melitta
Synonyms: keyhole sand dollar
- datedAny of various notched sand dollars of genera Rotula and Encope.
Synonyms & antonyms
nounAny of numerous clypeastroid sea urchins (sand dollars) of the genus Melitta
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Cite this entry
APA
keyhole urchin. (n.d.). In WatkinsX Dictionary. Retrieved November 4, 2026, from https://dictionary.watkinsx.com/word/keyhole%20urchin
MLA
“keyhole urchin.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/keyhole%20urchin. Accessed November 4, 2026.
Chicago
WatkinsX Dictionary, s.v. “keyhole urchin,” accessed November 4, 2026, https://dictionary.watkinsx.com/word/keyhole%20urchin.
Source: keyhole urchin on Wiktionary, CC BY-SA 4.0.