n. In music, one who sings the leading part. [F. accenteur.] In ornithology: [capitalized] A genus of passerine birds, family Sylviidæ, subfamily Accentorinæ.n. A name sometimes applied to the golden-crowned thrush or oven-bird, Siurus auricapillus, a well-known passerine bird of the United States, of the family Sylvicolidæ.