olivil

from The Century Dictionary.

• noun A bitter crystalline substance, C₁₄H₁₈O₅+H₂O, which occurs in the gum and other parts of the olive-tree. It is easily oxidized to vanillin. Also called olivite.
• noun A white, brilliant, starchy powder obtained from the gum of the olive-tree.

from the GNU version of the Collaborative International Dictionary of English.

• noun (Chem.) A white crystalline substance, obtained from an exudation from the olive, and having a bitter-sweet taste and acid proporties.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun organic chemistry A white crystalline substance, obtained from an exudation from the olive, and having a bittersweet taste and acid properties.