mumpsimus

mumpsimus

[muhmp-suh-muhs]
noun, plural mumpsimuses for 2.
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 ).

Origin:
1520–30; from a story, which perhaps originated with Erasmus, of an illiterate priest who said mumpsimus rather than sūmpsimus (1st plural perfect indicative of Latin sūmere to pick up; see consume) while reciting the liturgy, and refused to change the word when corrected

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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WordNet
mumpsimus

noun
a traditional notion that is obstinately held although it is unreasonable; "he still holds to the old mumpsimus that a woman's place is in the kitchen" 
WordNet® 3.0, © 2006 by Princeton University.
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