limpet

[lim-pit]
noun
any of various marine gastropods with a low conical shell open beneath, often browsing on rocks at the shoreline and adhering when disturbed.

Origin:
before 1050; Middle English lempet, Old English lempedu, nasalized variant of *lepedu < Latin lepada, accusative of lepas < Greek lepás limpet

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limpet (ˈlɪmpɪt)
 
n
1.  any of numerous marine gastropods, such as Patella vulgata (common limpet) and Fissurella (or Diodora) apertura (keyhole limpet), that have a conical shell and are found clinging to rocks
2.  any of various similar freshwater gastropods, such as Ancylus fluviatilis (river limpet)
3.  (modifier) relating to or denoting certain weapons that are attached to their targets by magnetic or adhesive properties and resist removal: limpet mines
4.  a small open caisson shaped to fit against a dock wall, used mainly in repair work
 
[Old English lempedu, from Latin lepas, from Greek]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Etymonline
Word Origin & History

limpet
O.E. lempedu, from M.L. lampreda "limpet" (see lamprey).
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
It is not yet known whether keyhole limpet hemocyanin is more effective than doxorubicin for bladder cancer.
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