a highly seasoned, hard sausage of beef and pork.
Also, peperoni.

1920–25, Americanism; < Italian peperoni, plural of peperone cayenne pepper plant, augmentative of pepe pepper Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
pepperoni (ˌpɛpəˈrəʊnɪ)
a highly seasoned dry sausage of pork and beef spiced with pepper, used esp on pizza
[C20: from Italian peperoni, plural of peperone cayenne pepper]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

"beef and pork sausage seasoned with pepper," 1919, Amer.Eng., from Italian.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
She had a stomachache, and asked to have some pepperoni to soothe it.
Choose from a farmer's salad, farmer's cheese board or a smoke and cure board
  with handcrafted pepperoni and sausage.
Kids can choose from some of the plainer pies on offer, such as the cheese, ham
  or pepperoni pizzas.
Will you find it useful the next time you and four friends sit down with a
  large pepperoni.
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