keyhole urchin en · NOUN
Meanings
- Any of numerous clypeastroid sea urchins (sand dollars) of the genus Melitta
- (dated) Any of various notched sand dollars of genera Rotula and Encope.
Forms
| Spelling | Features | Labels | Source |
|---|---|---|---|
| keyhole urchins | Number=Plur | lexicographic |
Deriveds
five-holed keyhole urchin · six-holed keyhole urchin