There are multiple definitions:

1. roll back malaria(English)

   • MACEPA, WHO
   • Malaria
   • https://www.who…secretariat/en/

2. receptor-binding motif(English)

   • ACE2, ARDS, COVID-19, RBD, SARS
   • Virology, Receptors
   • https://doi.org…02.2020.1834457

3. retrograde bolus movement(English)

   • AET, DBI, EA, EE, GERD, GES, HREM, MII, MNBI, NARI, PPI, PSPWI, RI
   • Mouth, esophagus and stomach
   • https://doi.org…/s-0035-1564715

4. ratio-based metric(English)

   • EF, FFR, AIx
   • Ratio-based metric, Product-based metric, Difference based metric
   • https://doi.org…siol.00056.2018
   • https://doi.org…vm.2022.1013194

5. reticular basement membrane(English)

   • ACO, COPD, CS, EBB, ES, NLFS
   • Pulmonology, Membranes
   • https://doi.org…931-023-02527-x

6. restricted Boltzmann machine(English)

   • CWL, DNN, HMM, PDE, PWL, WFST
   • Machine learning
   • https://doi.org…OC.2021.3065238

7. rule-based-method(English)

   • EF, LDRBM, PDE
   • Model(ing), Cardiology, Biophysics
   • https://doi.org…ech.2023.111643