mugissor Save DMLBS Du Cange mugissor [cf. CL mugire] , one who murmurs or grumbles. unde murmurator quod aliter dicitur ‥ ~or Osb. Glouc. Deriv. 343. MUGISSOR. Papiæ : Fallax, callidus, murmurator. In Glossis Antiquis MSS. : Callidus anus, musator.