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mumpsimus

[muhmp-suh-muh s] /ˈmʌmp sə məs/
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
1520-1530
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
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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