There are multiple definitions:

1. registered dietician(English)

   • Diet, Specialist / expert

2. relative dispersion(English)

   • Statistics

3. reference diameter(English)

   • DS, MLD
   • Coronary circulation

4. related donor(English)

   • alloHCT, ALL, AML, BMT, CLL, CML, HCT, HL, MDS, MM, NHL, NMDP, URD, autoHCT
   • Transplantation, Hematology
   • https://doi.org…7/s002770050547

5. risk difference(English)

   • NNTB, NNTH, CDP, CMH, HSD, PSD, SD
   • Quality and outcomes, Risk factor
   • https://doi.org…C2014-0-02732-3

6. retinal detachement(English)

   • may be associated with glaucoma in a variety of ways, including the following: chance occurrence as both are common diseases, genetic linkage, common underlying mechanism such as trauma, cataract surgery with vitreous loss, proliferative retinopathy, or retinopathy of prematurity. Furthermore treatment for retinal detachment may cause glaucoma, and treatment of glaucoma may cause retinal detachment
   • IOP, FEVR, RT
   • Ophthalmology
   • https://doi.org…02394-8.00018-8
   • https://doi.org…55/2022/1968434

7. rheumatic disease(English)

   • forms an underlying medical condition affecting severity and prognosis of superimposed viral disease
   • UMC
   • Rheumatology, Risk factor, Epidemiology, Virology
   • https://doi.org…47/TCRM.S173834

8. radial diffusivity(English)

   • AF, DTI, fMRI, LH, RH, SLF, AD, FA, MD, RD
   • Medical imaging
   • https://doi.org…hum.2021.635750
   • https://doi.org…598-021-87069-2

9. rare disease(English)

   • there are approximately 10,000 types, and 473 million people are affected worldwide
   • HAE, IRUD, NGS, DNWG, UDNI, URD
   • Diagnostics, Classification
   • https://doi.org…al.pone.0265847
   • https://doi.org…bh.2023.1248260

10. rate difference(English)

    • calculated to compare incidence variations in different subpopulations
    • AI, AN, API, CRC, NA, PI
    • Oncology, Epidemiology, Surveillance, Registry
    • https://doi.org…1002/cncr.24216

11. reciprocal delay(English)

    • using isokinetic dynamometers this shows the time loss in reciprocal transitions between extension and flexion phases
    • ACL, ACLR, HK, IKDC, JAPT, PT, TPT, ER, H/Q
    • Musculoskeletal system, Sports medicine, Injury, Orthopedics
    • https://doi.org…edicina58091187
    • https://doi.org…nostics13172787

12. rectus diastasis(Latin)

    • diastasis of the rectus abdominis muscles is common, particularly in postpartum women. Although imaging is not always mandatory for assessment, several cross-sectional imaging techniques, in particular ultrasound, computed tomography and magnetic resonance imaging can depict the abdominal wall in exquisite detail
    • CT, MRI, US, DRA
    • Myocyte / muscle, Pregnancy, Medical imaging
    • https://doi.org…029-021-02463-z

13. reward dependence(English)

    • refers to adaptive defense mechanisms
    • SD, ST, IDS
    • Psychology, Adaptation & plasticity, Behavior(al science)
    • https://doi.org…res.2012.07.026

14. rumination disorder(English)

    • defined as the repeated regurgitation of food, followed by rechewing and reswallowing or spitting out. This should be differentiated from gastroesophageal reflux or vomiting with a primary medical cause. Manometry, in particular high-resolution esophageal manometry, may assist in the diagnosis
    • ARFID, GERD
    • Mouth, esophagus and stomach
    • https://doi.org…337-022-00706-7

15. residual disease(English)

    • refers to impact of residual disease as a prognostic factor for survival, e.g. in women with advanced epithelial ovarian cancer after primary surgery
    • EOC, IDS, LVRD, NMRD, QUIPS, PDS, SVRD, NGR
    • Prognosis, Ovary and uterus, Oncology
    • https://doi.org…8.CD015048.pub2

16. radiodermatitis(English)

    • the main side effect of ionizing radiation exposure in the skin
    • Dermatology, Radiotherapy /radiation