M / murmŭrātor
noun

murmŭrātor

gen. murmŭrātōris · gender masculine · decl. 3rd
a murmurer
a murmurer (post-class.): summussi murmuratores, Paul. ex Fest. p. 299 Müll.: adversus Deum murmuratores, Aug. Retract. 2, 20; Vulg. Judae, 16.