keyhole urchin

English

Noun

keyhole urchin (plural keyhole urchins)

Any of numerous clypeastroid sea urchins (sand dollars) of the genus Melitta
Synonym: keyhole sand dollar
(dated) Any of various notched sand dollars of genera Rotula and Encope.

Derived terms

five-holed keyhole urchin
six-holed keyhole urchin

References

“keyhole”, in Webster’s Revised Unabridged Dictionary, Springfield, Mass.: G. & C. Merriam, 1913, →OCLC.

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