Any one of a number of similar complex resins obtained from the bark of several trees and shrubs of the Styrax family. The most common of these is liquid storax, a brown or gray semifluid substance of an agreeable aromatic odor and balsamic taste, sometimes used in perfumery, and in medicine as an expectorant.

a vanilla-scented resin from various trees of the genus Styrax

A fragrant gum resin.