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Meaning of mumpsimus

mump•si•mus

Pronunciation: (mump'su-mus), [key]
— pl. -mus•es
  1. adherence to or persistence in an erroneous use of language, memorization, practice, belief, etc., out of habit or obstinacy (opposed to sumpsimus).
  2. a person who persists in a mistaken expression or practice (opposed to sumpsimus).
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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