levulin

from The Century Dictionary.

• noun A carbohydrate (C₆H₁₀O₅) occurring in the tubers of certain species of Helianthus.

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

• noun (Chem.) A substance resembling dextrin, obtained from the bulbs of the dahlia, the artichoke, and other sources, as a colorless, spongy, amorphous material. It is so called because by decomposition it yields levulose.

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

• noun organic chemistry A substance resembling dextrin, obtained from the bulbs of the dahlia, the artichoke, and other sources, that yields levulose on decomposition.