WordNet (r) 3.0 (2006):

ESR
    n 1: 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 [syn: erythrocyte
         sedimentation rate, ESR, sedimentation rate, sed
         rate]
    2: microwave spectroscopy in which there is resonant absorption
       of radiation by a paramagnet [syn: electron spin resonance,
       ESR, electron paramagnetic resonance]

The Free On-line Dictionary of Computing (19 January 2023):

Eric S. Raymond
ESR

    One of the authors of the Hacker's Jargon File.
   Eric was involved in the JOLT project and GNU Emacs as
   well as maintaining several FAQ lists.  He is a keen
   advocate of open source.

   (http://ccil.org/~esr).

   E-mail: 

   (1998-10-20)