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The word mussitare could not be parsed. Trying a normal dictionary lookup:
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‡ mussĭtābundus, a, um, adj. [mussito], suppressing the voice, silent, Vet. Gloss.
mussĭtātĭo, ōnis, f. [mussito], a suppression of the voice, silence (post-class.), App. M. 8 init.; Hier. in Isa. praef. 9; Tert. Pudic. 7; Cael. Aur. Acut. 1, 3, 35.
mussĭtātor, ōris, m. [mussito],