sea urchin
Concise Oxford English Dictionary © 2008 Oxford University Press:
sea urchin
▶noun a marine echinoderm which has a spherical or flattened shell covered in mobile spines, with a mouth on the underside and calcareous jaws. [Class Echinoidea.]
'sea urchin' also found in these Oxford entries:
Aristotle's lantern
- echidna
- echinacea
- echinoderm
- echinoid
- echinus
- kina
- sand dollar
- urchin
