esr

(hematology) Initialism of erythrocyte sedimentation rate. [(hematology) The rate (usually expressed in millimeters per hour) at which red blood cells precipitate in a vertical tube over a period of one hour, often determined as a screening test for the presence of inflammation.]

Initialism of electron spin resonance. [(physics) The absorption of radiation by species having unpaired electrons when placed in a magnetic field that is used spectroscopically to detect and study free radicals]

(electronics) Initialism of equivalent series resistance.

(software) Initialism of extended-support release.

Initialism of Eric S. Raymond.