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mumpsimus

[ muhmp-suh-muhs ]
/ ˈmʌmp sə məs /
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noun, plural mump·si·mus·es for 2.

adherence to or persistence in an erroneous use of language, memorization, practice, belief, etc., out of habit or obstinacy (opposed to sumpsimus).
a person who persists in a mistaken expression or practice (opposed to sumpsimus).

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On the farm, the feed for chicks is significantly different from the roosters’; ______ not even comparable.

Origin of mumpsimus

First recorded in 1520–30; from a story, perhaps originating with Erasmus, of an illiterate Catholic priest who, while saying the postcommunion prayer at Mass, said mumpsimus rather than sūmpsimus (1st plural perfect indicative of Latin sūmere “to take, take up”): “Quod ōre sūmpsimus, Domine, pūrā mente capiāmus” (“What we have taken by mouth, O Lord, may we keep with a pure mind”) and refused to change the word when corrected; see consume
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2021
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