noun a keyhole limpet. ·see fissurella.
2. limpet ·noun in a general sense, any hatshaped, or conical, gastropod shell.
3. limpet ·noun any species of siphonaria, a genus of limpet-shaped pulmonifera, living between tides, on rocks.
4. limpet ·noun any one of many species of marine shellfish of the order docoglossa, mostly found adhering to rocks, between tides.