There are multiple definitions:

1. renal interstitial fibrosis(English)

   • EMT, MiR-21, PTEN, PTFS
   • Nephrology, Pathology
   • https://doi.org….1002/jcb.27668

2. rigid internal fixation(English)

   • BSSO, MRI, SMV, TMJ
   • Medical imaging, Dentistry
   • https://pubmed.…h.gov/12607859/

3. recurrent implantation failure(English)

   • a disease associated with endometrial receptivity dysfunction
   • CEBPB, cAMP, CCAAT, ChIP, EBP, HESC, MPA, RAR-alpha
   • Obstetrics, Ovary and uterus
   • https://doi.org…ndo.2022.753416

4. rifampicin(English)

   • the most commonly used drug and acts on bacterial RNA polymerase to inhibit essential protein transcription. but resistance to treatment has been observed
   • MTB/RIF, ART, DOT, DST, HIV, MDR, MDR-TB, TB, MTB
   • Microbiology, Pharmacology / pharmaceutics, Public Health
   • https://doi.org…met.2012.07.021

5. Ramadan intermittent fasting(English)

   • a monthlong practice in which Muslims fast during the whole day from sunrise to sunset
   • FM, WHR, FBG
   • Nutrition, Menopause, Adiposity
   • https://doi.org…edicina59071191

6. reduction-in-force(English)

   • CDC, DOGE, FDA, HHS, NIH, NINDS
   • Organizations (governmental), Health care
   • https://www.sci…es-spiral-chaos
   • https://doge.gov/