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1. Microwave spectroscopy in which there is resonant absorption of radiation by a paramagnet
   - electron spin resonance, electron paramagnetic resonance
    
2. The rate at which red blood cells settle out in a tube of blood under standardized conditions; a high rate usually indicates the presence of inflammation
   - erythrocyte sedimentation rate, sedimentation rate, sed rate

Type of: microwave spectroscopy, rate

Encyclopedia: ESR