Roussette \Rous*sette"\, n. [F.; -- so called in allusion to the color. See {Russet}.] 1. (Zo["o]l.) A fruit bat, especially the large species ({Pieropus vulgaris}) inhabiting the islands of the Indian ocean. It measures about a yard across the expanded wings. 2. (Zo["o]l.) Any small shark of the genus {Scyllium}; -- called also {dogfish}. See {Dogfish}.