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uncinus

noun plural -cini (-ˈsaɪnaɪ)
  1. zoology a small hooked structure, such as any of the hooked chaetae of certain polychaete worms
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Word Origin

C19: from Late Latin: hook, from Latin uncus
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012