Etymology
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levulose (n.)

old name of the sugar isomeric with dextrose but distinguished from it by turning the plane of polarization to the left, 1865 (1864 in German) from Latin laevus "left" (from PIE *laiwo- "left;" see left (adj.)) + sugar ending -ose (2). 

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Definitions of levulose

levulose (n.)
a simple sugar found in honey and in many ripe fruits;
Synonyms: fructose / fruit sugar / laevulose
From wordnet.princeton.edu