There are multiple definitions:

1. low frequency(English)

   • HF, ULF, VLF
   • Signal analysis

2. left frontal(English)

   • RF
   • Anatomy

3. low flow(English)

   • AS, HF, HG, LG, NF
   • Hemodynamics

4. Lichtenberg figure(English)

   • pathognomonic skin sign for lightning trauma or following an electrical injury from a high-voltage system; aka ferning pattern or keraunographic markings
   • Injury, Dermatology
   • https://doi.org…med.2021.663807

5. lactoferrin(English)

   • a glycorprotein contained in large amounts in human milk and neutrophils, and is one of the prebiotics present in the human body. The mechanisms of LF in relation to inflammation and infection are varied
   • Inflammasome
   • https://doi.org….1111/jog.12171

6. lymphatic filariasis(English)

   • a major public health problem globally and in the Pacific Region. The Global Programme to Eliminate LF has made great progress but LF is persistent and resurgent in some Pacific countries and territories
   • CDC, MX, MMRR, MDA
   • Parasitology, Lymphatic system/lymphoma, Public Health
   • https://doi.org…al.pntd.0006816
   • https://doi.org…par.2021.03.002

7. licorice flavonoid(English)

   • extracted from the roots of Glycyrrhiza uralensis (licorice) which seems to effectively attenuate LPS-induced pulmonary inflammation through inhibition of inflammatory cells infiltration and inflammatory mediator release which subsequently reduces neutrophil recruitment into lung and neutrophil-mediated oxidative injury
   • ARDS, BALF, COPD, LPS
   • Pulmonology
   • https://doi.org…imp.2008.11.004

8. Lassa fever(English)

   • a viral hemorrhagic fever, caused by an arenavirus discovered in 1969 in Nigeria. Nosocomial outbreaks and high seroprevalences have been recorded in Nigeria, Sierra Leone, Guinea and Liberia. After 7–10 days of incubation, humans develop fever, malaise, headache, myalgias and sore throat, although most have no recognized symptoms
   • LASV
   • Virology
   • https://doi.org…05191-1.00005-3

9. labyrinthine fistula(English)

   • vHIT, VOR
   • ENT
   • https://doi.org…000000000003527

10. lateral flow(English)

    • CRP, LF-RDT, LMIC
    • Diagnostics, Biomarker
    • https://doi.org…al.pntd.0010685

11. last-to-first(English)

    • refers to column mapping, and is a key feature of the Burrows-Wheeler matrix
    • BWT, DAWG, GEM, MAPQ, MUM, SDP, SIMD, SIMT
    • Genomics
    • https://www.hpl…/SRC-RR-124.pdf
    • https://dx.doi.…OC.2015.2455551

12. low fatigue(English)

    • GAD-7, HF, HRQoL, MFIS-5, PHQ-9, MS, RRMS
    • Fatigue
    • https://doi.org…883-023-03423-z

13. longitudinal function(English)

    • may refer to longitudinal strain of left ventricle
    • DCM, GLS, LVEF, MAPSE, MASV, ULS
    • Cardiology, Biophysics
    • https://doi.org…cho.2017.12.010