lim·pet /ˈlɪmpət/
 帽貝,堅守崗位的職員
 Lim·pet n.  Zool.
 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.
 Note: ☞ The common European limpets of the genus Patella (esp. Patella vulgata) are extensively used as food. The common New England species is Acmæa testudinalis. Numerous species of limpets occur on the Pacific coast of America, some of them of large size.
 3. Any species of Siphonaria, a genus of limpet-shaped Pulmonifera, living between tides, on rocks.
 4. A keyhole limpet. See Fissurella.
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 limpet
      n 1: mollusk with a low conical shell
      2: any of various usually marine gastropods with low conical
         shells; found clinging to rocks in littoral areas