r, s, 1222 R*, S*, 1222 rabbit, 1223 racemate, 1223 racemic, 1223 racemic compound, 1223 racemic conglomerate, 1223 racemic mixture [obsolete] , 1224 racemization, 1224 racemo structures in polymers , 1224 rad , 1224 radial electrostatic field analyser in mass spectrometry , 1224 radial elution (radial development) or circular elution (circular development) in planar chromatography , 1225 radian , 1225 radiance, , 1225 radiant energy, , 1226 radiant energy density, , , 1226