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Denoting levorotation, or crystals or solutions capable of causing it; as a chemical prefix, usually abbreviated l- or (-).
Medical Dictionary for the Health Professions and Nursing © Farlex 2012
levorotatory(of a crystal, liquid or solution) having the property of rotating a plane of polarized light to the left (e.g. fructose). Compare DEXTROROTATORY.
Collins Dictionary of Biology, 3rd ed. © W. G. Hale, V. A. Saunders, J. P. Margham 2005