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racemic

ra·ce·mic [ ray smik, rə smik, ray sémmik, rə sémmik ]


adjective 
Definition:
 
not deflecting light: describes a chemical compound that does not deflect or absorb any of the light passing through it. This is because it consists of a precise mixture of dextrorotatory and levorotatory isomers.

[Late 19th century. < Latin racemus "bunch of grapes," because the compound was originally derived from grapes]
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