<chemistry> Pertaining to, or designating, an acid found in many kinds of grapes. It is also obtained from tartaric acid, with which it is isomeric, and from sugar, gum, etc, by oxidation. It is a sour white crystalline substance, consisting of a combination of dextrorotatory and levorotatory tartaric acids.

<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.

Origin: Cf. F. Racemique. See Raceme.

(01 Mar 1998)

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