There are multiple definitions:

1. resting energy expenditure(English)

   • COPD, SYSM
   • Respiratory system
   • https://doi.org…147/COPD.S25293

2. responsive esophageal eosinophilia(English)

   • EoE, pEEr, PPI, RE, EDP
   • Allergy, Mouth, esophagus and stomach
   • https://doi.org…0535-016-1213-1
   • https://doi.org…aci.2014.08.043

3. rare earth element(English)

   • including lanthanum through lutetium, along with scandium and yttrium
   • GAO
   • Materials science
   • https://doi.org…science.1187597