Limpet

Part of speech: noun (n.)

1. In a general sense, any hatshaped, or conical, gastropod shell.

2. Any one of many species of marine shellfish of the order Docoglossa, mostly found adhering to rocks, between tides.

3. Any species of Siphonaria, a genus of limpet-shaped Pulmonifera, living between tides, on rocks.

4. A keyhole limpet. See Fissurella.