| a colorless, oily, slightly water-soluble liquid terpene ether, C10H18O, having a camphorlike odor and a pungent, spicy, cooling taste, found in eucalyptus, cajeput, and other essential oils: used in flavoring, perfumery, and medicine chiefly as an expectorant. |

eucalyptol eu·ca·lyp·tol (y&oomacr;'kə-lĭp'tôl', -tōl') or eu·ca·lyp·tole (-tōl')
n.
A colorless oily liquid derived from eucalyptus and used in pharmaceuticals.