limpet
Concise Oxford English Dictionary © 2008 Oxford University Press:
limpet/ˈlɪmpɪt/
▶noun a marine mollusc with a shallow conical shell and a broad muscular foot for clinging tightly to rocks. [Patella vulgata and other species.]
– origin OE lempedu, from med. L. lampreda ‘limpet, lamprey’.
'limpet' also found in these Oxford entries:

