Webster's English Dictionary

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limpet

lim.pet \'lim-p*t\ n [ME lempet, fr. OE lempedu, fr. ML lampreda] 1: a 
   marine gastropod mollusk with a low conical shell broadly open beneath  
   that browses over rocks or timbers in the littoral area and adheres very 
   tightly when disturbed 2: a person who clings tenaciously to someone or 
   something  3: an explosive designed to cling to the hull of a ship