ˈīˌrōn, ̷ ̷ˈ ̷ ̷ noun
( -s )
Etymology: International Scientific Vocabulary ir is + -one; originally formed as German iron
: any of several oily liquid isomeric ketones C 14 H 22 O or a mixture of some of them that have a strong odor of violet and orrisroot, that occur in orris oil, and that are used in perfumes