There are multiple definitions:

1. heart rate(English)

   • AF, HRR, HRV, LBBB, MPHR, RBBB, THR
   • Cardiology, Electrophysiology

2. hypersensitive response(English)

3. high-resolution(English)

   • TEM
   • Bioengineering

4. high resiliency(English)

   • DTI, FSA, ILD, NPUAP
   • Resilience

5. hazard ratio(English)

   • OR, PAR, RR, aHR, sHR
   • Risk factor, Statistics, Prognosis, Quality and outcomes

6. homologous recombination(English)

   • DNA, HGSOC, BRCA, EOC, PARP, PARPi
   • Genetics, Oncology
   • https://doi.org…19840-7.00007-8
   • https://doi.org…3048-019-0579-0

7. hormone receptor(English)

   • positivity had no prognostic value for IBC patient's survival after NAC among HR-positive (HR+)/human epidermal growth factor receptor 2–positive (HER2+), HR+/HER2-negative (HER2−), and HR-negative (HR−)/HER2+ subtypes
   • ER, IBC, PR, HER2, NAC, kRT, pCR, PgR
   • Hormone, Receptors, Endocrinology
   • https://doi.org…885-020-06940-z
   • https://doi.org…0549-010-1142-2

8. heptad repeat(English)

   • N-glycans in HR1 and HR2 coordinately downregulate viral fusion and virulence
   • BC, NDV
   • Virology
   • https://doi.org…28/JVI.06380-11

9. hepatic resection(English)

   • see also LR
   • HAIC, HCC, LR, RFA, TACE, TAI
   • Liver disease, Oncology, Surgery
   • https://doi.org….1038/srep07252

10. homing receptor(English)

    • may show differential expression in tonsils and draining lymph nodes
    • LN, mLN, PLN, PSLN, RLN
    • Receptors, Immunology, Veterinary medicine
    • https://doi.org…imm.2006.11.008

11. high-risk [patient](English)

    • EFS, EVAIA, OS, SR, VACA, VAIA
    • Risk factor, Chemotherapy
    • https://doi.org…CO.2008.16.5720

12. histamine-release(English)

    • as assay a next-generation diagnostic tool
    • AGS, IgE, MAT, MBR
    • Allergy, Asthma, Diagnostics
    • https://doi.org…147/JAA.S265660

13. homologous recombination(English)

    • AML, APC/C, APH, ARM, AT, ATM, BAC, BS, CUE, FISH, HECT, HJ, MEF, MMC, MRN, NLS, PCNA, PIKK, RACE, RING, RTK, SILAC, SLIM, TLS, UBD
    • Genetics
    • https://doi.org…101.2014.956475