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Marcion

American  
[mahr-shuhn, -shee-uhn, -see-uhn] / ˈmɑr ʃən, -ʃi ən, -si ən /

noun

  1. a.d. c100–c160, Christian Gnostic.

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Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.