Real Dictionary

vetiver in American English
an East Indian grass (Vetiveria zizanioides) whose roots yield a fragrant oil used in perfumes, cosmetics, etc.
noun: the long, fibrous, aromatic roots of an East Indian grass, Vetiveria zizanioides, used for making hangings and screens and yielding an oil used in perfumery

vetiver in British English
noun: a tall hairless grass, Vetiveria zizanioides, of tropical and subtropical Asia, having aromatic roots and stiff long narrow ornamental leaves