There are multiple definitions:

1. proton exchange membrane(English)

   • fuel cell that operates at relatively low temperatures and is composed of two electrodes and a conductive elecrolyte
   • MFC
   • Engineering aspects
   • https://doi.org…1039/C9SE00381A

2. paired-end mapping(English)

   • a large scale genome-sequencing method to identify SV’s
   • GWAS, SV
   • Genomics

3. protein energy malnutrition(English)

   • form of malnutrition that is defined as a range of conditions arising from coincident lack of dietary protein and/or energy (calories) in varying proportions
   • Nutrition, Proteins, Environment
   • https://doi.org…pcl.2009.07.001

4. post-exertional malaise(English)

   • POSH, POTS, SBP, SV, CFS, ME, FMD, PORH, OI, COVID-19, CVS, PCS, POTS, CPET, HRV
   • Exercise & Training, Chronic fatigue syndrome
   • https://doi.org…med.2021.642710
   • https://doi.org…acc.2021.06.045
   • https://doi.org…rev.2020.102527

5. prescription-event monitoring(English)

   • MedDRA/J, LLT
   • Monitoring, Pharmacology / pharmaceutics

6. polymer electrolyte membrane(English)

   • may refer to a fuel cell
   • MEA, DMFC, OCV
   • Membranes
   • https://doi.org…science.1090920

7. pulmonary endometriosis(English)

   • is rare, and drug therapy remains the primary treatment. However, these patients frequently experience recurrent hemoptysis that is refractory to pharmacological intervention
   • PDT
   • Respiratory system, Pathology, Therapeutic approaches
   • https://doi.org…000605231204485