orrisroot
noun
or·ris·root
| \ ˈȯr-əs-ˌrüt, ˈär-əs-, -ˌru̇t
\
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Medical 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