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From Biology-Online Dictionary | Biology-Online Dictionary
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(Science: chemistry) Denoting a mixture of optically active compounds that is itself optically inactive, being composed of an equal number of dextro-and levorotatory substances, which are separable.

Those compounds internally compensated (i.e., having an internal plane of symmetry), and therefore not separable into d and l (or _ and -) forms, are termed meso.