There are multiple definitions:

1. filtration fraction(English)

2. force feedback(English)

   • VR

3. fragility fracture(English)

   • osteoporosis is an age-related disease, characterized by decreased bone mass and damage to the microstructure of bone tissue, leading to decreased bone strength and increased risk of fractures
   • BMD, FFX
   • Frailty, Injury, Aging
   • https://doi.org…891-021-04616-8

4. fresh frozen [sample](English)

   • required for genome-wide methods to detect DNA-methylation in healthy and diseased tissue
   • DNA, FFPE, MSP, SNP
   • Genomics, Epigenetics, Biochemistry
   • https://doi.org…binvest.2015.53

5. fusiform face [area](English)

   • area in the fusiform gyrus that is significantly more active when subjects view faces than when they viewed assorted common objects; aka FFA
   • FFA, fMRI
   • Brain (dys)function
   • https://doi.org…7-11-04302.1997

6. Fitbit Flex(English)

   • an activity tracking device
   • MVPA, PA, SED
   • Exercise & Training
   • https://doi.org…/ijerph18052716

7. food fussiness(English)

   • refers to prospective relationships from appetite to adiposity measures
   • AEBQ, BEBQ, BMI, BMIz, CEBQ, EOE, EUE, FF, FR, SE, SR
   • Nutrition, Diet, Adiposity
   • https://doi.org….1111/obr.13169

8. fundus firm(English)

   • Pregnancy, Neonatal situation, Ovary and uterus
   • https://wildiri…postpartum-care

9. force fluids(English)

   • Biophysics

10. friend-foe(English)

    • refers to discrimination task. Acute caffeine intake before and after fatiguing exercise improves performance
    • ET, RVIP, VIG
    • Aviation medicine, Exercise & Training, Fatigue
    • https://pubmed.…h.gov/15497366/

11. follicular fluid(English)

    • granulocyte colony stimulating factor (G-CSF) immunoassay
    • ELISA, G-CSF, SET
    • Endocrinology, Gynecology, Embryology /reproduction
    • https://doi.org…90.2019.1631283

12. fluticasone furoate(English)

    • a corticosteroid used for asthma
    • MASK, OAH, CET, DL, COPD, MF, RS, SLS, SITT, UMEC, VI
    • Allergy, ENT, Asthma
    • https://doi.org…601-020-00342-x
    • https://doi.org…147/POR.S144157
    • https://doi.org…47/COPD.S370577

13. forme fruste(French)

    • in general an atypical and usually incomplete manifestation of a disease. Here, one of three etiologic types of primary mitral regurgitation
    • BD, FED, GLS, HF, MR, MV
    • Cardiology
    • https://doi.org…cmg.2019.03.024

14. fenofibrate(English)

    • exerts protein-anabolic effects on the liver and catabolic effects on muscles
    • HFFD, LFFD, BCAA, BCKA
    • Myocyte / muscle, Liver disease
    • https://doi.org….1111/iep.12368

15. formula-fed(English)

    • breast-fed infants are at a 6-10-fold lower necrotising enterocolitis risk than formula-fed infants
    • DF, DSLNT, HMO, GOS, NEC
    • Nutrition, Neonatology, Gastroenterology
    • https://doi.org…007114516002038

16. fiber-rich feed(English)

    • AIR, AIRg, FSIGTT, SI, SMC, SS
    • Insulin, Diet, Veterinary medicine
    • https://doi.org….1111/evj.12812

17. fundamental frequency(English)

    • refers to an approach to get better endocardial border delineation
    • EBD, EBDI, LV, SH, SHI
    • Medical imaging, Cardiology
    • https://doi.org…9149(98)00826-1

18. form factor(English)

    • serves as a morphological indicator of arterial pulse waveform and concerns the formula to calculate aortic FF = 100*(MAP-DAP)/PP, where aortic PP=(SAP−DAP). FF is expressed as % and decreases with age and is lower in subjects with central hypertension
    • DAP, MAP, PP, PPA, SAP
    • Hemodynamics, Signal analysis, Model(ing), Ratio-based metric, Aging, Hypertension
    • https://doi.org…JAHA.124.037064