muscularium Save DMLBS Du Cange muscularium [1 muscula +- arium] , place in which flies abound. CathA (v. muscarius 2a). MUSCULARIUM, dimin. a Muscarium. Glossar. Provinc. Lat. ex Cod. reg. 7657 : Devendalh, Prov. flabellum, muscarium, Muscularium.