orrisroot

or·ris·root

noun
\ˈȯr-əs-ˌrüt, ˈär-əs-, -ˌru̇t\

Definition of ORRISROOT

: the fragrant rootstock of any of three European irises (Iris pallida, I. florentina, and I. germanica) used in pulverized form in perfumery and pharmacology—called also orris