Mussorgsky, Modest Syllabification: (Mus·sorg·sky, Modest)Pronunciation: /məˈsôrgskē, -ˈzôrg-/ (also Moussorgsky)Definition of Mussorgsky, Modest (1839–81), Russian composer; full name Modest Petrovich Mussorgsky. He wrote the opera Boris Godunov (1874) and Songs and Dances of Death (1875–77). Mussorgsky, Modest in other Oxford dictionaries Definition of Mussorgsky, Modest in the British & World English dictionary