There are multiple definitions:

1. functional imaging(English)

   • Medical imaging

2. fatal insomnia(English)

   • a rare human prion disease characterized by sleep–wake disturbances, thalamic degeneration and deposition of type 2 disease-specific prion protein
   • PrPSC, FFI
   • Sleep medicine, Brain (dys)function
   • https://dx.doi.…nnp.2008.154815

3. fecal incontinence(English)

   • it is estimated that one in three patients seeing a primary care provider may suffer from FI. The prevalence of FI in adults that are not hospitalized or in nursing homes ranges from 7% to 15%. Up to 33% of hospitalized adults and 70% of adults in nursing homes will suffer from FI. It is the second leading cause for nursing home placement
   • TAMS, LAS, PFD, ASLAC, OVD
   • Home care, Obstetrics, Gastroenterology, Disability, Psychology
   • https://doi.org…13037-7.00035-2
   • https://doi.org…tro.2016.02.009
   • https://doi.org/10.5772/57502
   • https://doi.org….2217/whe.13.17

4. face individuation(English)

   • to investigate this critical brain function in the human species, an oddball fast periodic visual stimulation approach has been introduced
   • FPVS
   • Brain (dys)function, Electrophysiology
   • https://doi.org….1111/ejn.14865

5. fluorescence intensity(English)

   • the basis for classifying phenotypes by fluorescence-label flow cytometry
   • MESF
   • Fluorescence, Classification
   • https://doi.org…/meth.2000.1009

6. frailty index(English)

   • BMI, CGA, NMA, FFI
   • Frailty, Scoring systems/scales
   • https://doi.org…000000000010933

7. fractionated interval(English)

   • AF, CFAE, DF, PVI, PWI
   • Cardiology, Electrophysiology
   • https://doi.org….1111/jce.12166

8. functional instability(English)

   • defined as the subjective feeling of ankle instability or recurrent, symptomatic ankle sprains (or both) due to proprioceptive and neuromuscular deficits
   • AJFAT, FAI, IAC
   • Musculoskeletal system, Health status
   • https://doi.org…2-6050-46.6.634

9. fundamental imaging(English)

   • 3DE, HI, LV
   • Cardiology, Echography/ultrasound, Medical imaging
   • https://doi.org…mje.2000.103244

10. food insecure(English)

    • FS, KNHANES, SES
    • Nutrition, Safety and health, Lifestyle, Public Health
    • https://doi.org…/ijerph20176695

11. fructose intolerance(English)

    • a widespread non-genetic condition in which the incomplete absorption of fructose leads to gastro-intestinal disorders. The crucial role of microbial dysbiosis on the onset of these intolerance symptoms together with their persistence under free fructose diets are driving the scientific community towards the use of probiotics as a novel therapeutic approach
    • Allergy, Gastroenterology, Nutrition, Microbiology
    • https://doi.org…3390/nu14122488

12. facial index(English)

    • AHI, BMI, CI, OSA
    • Anatomy, Sleep medicine
    • http://pubmed.n…h.gov/23697283/

13. fluorescence imaging(English)

    • multimodal surgical guidance during sentinel node biopsy
    • SN
    • Fluorescence, Medical imaging
    • https://doi.org…radiol.14140322