mumpsimus

[muhmp-suh-muhs]

mump·si·mus

[muhmp-suh-muhs]
noun, plural mump·si·mus·es 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. 2012.
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Mumpsimus is always a great word to know.
So is ninnyhammer. Does it mean:
a calculus or concretion found in the stomach or intestines of certain animals, esp. ruminants, formerly reputed to be an effective remedy for poison.
a fool or simpleton; ninny.
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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