mĕtăcismus

i, m.

for mytacismus, = μυτακισμός, from μῦ

I. a frequent repetition of the letter M, Mart. Cap. 5, § 514; also the pronunciation of M at the close of a word before a word beginning with a vowel, metacism, Diom. p. 448 P.
Lewis & Short
A Latin Dictionary, 1879
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