| racaemic | <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. (05 Mar 2000) |
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| racaemic calcium pantothenate | <chemistry> A mixture of the calcium salts of the dextrorotatory and levorotatory isomers of pantothenic acid; same uses as calcium pantothenate. (05 Mar 2000) |
| racaemic mixture | <chemistry> A 50:50 mixture of two enantiomers (such a mixture does not rotate plane-polarized light). (09 Jan 1998) |