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prot-

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  1. variant of proto- before a vowel: protamine.
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Prot.

  1. Protestant.
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Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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British Dictionary definitions for prot

prot-

combining form
  1. a variant of proto-
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Prot.

abbreviation for
  1. Protestant
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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

Word Origin and History for prot

Prot

n.

colloquial shortening of Protestant (n.), used by Catholics, often contemptuous.

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Online Etymology Dictionary, © 2010 Douglas Harper

prot in Medicine

prot-

pref.
  1. Variant ofproto-