sumpsimus

Etymology
From, c. 1540–50.

Noun

 * 1) Adherence to or persistence in using a strictly correct term in rejection of a more common (but technically incorrect) form.
 * 2) * c. 1575,, Autobiography, John Nichols (ed.)
 * I'll not change my old mumpsimus for your new sumpsimus!
 * 1) A person obstinate or zealous about such correctness; a pedant.
 * 1) A person obstinate or zealous about such correctness; a pedant.