There are multiple definitions:

1. adenopharyngeal conjunctival(English)

   • ENT, Ophthalmology

2. aspirin plus phenacetin plus caffeine(English)

3. atrial premature contraction/complex(English)

   • PSVT, VPC
   • Cardiology

4. antigen presenting cell(English)

   • aAPC, TCR, IS, MMAE
   • Immunology
   • https://doi.org/10.1186/ar559
   • https://doi.org…1824-7288-38-35

5. adenomatous polyposis coli(English)

   • FAP, AMER1
   • Gastroenterology
   • https://doi.org…pa.2018-0570-ra

6. American Plastics Council(English)

   • Organizations (documentation), Environment

7. Ambulatory Payment Classification group(English)

   • APG
   • Classification, Financial issues

8. anaphase-promoting complex(English)

   • mediates selective proteolysis of various mitotic regulators
   • PTTG
   • Cell biology, Genetics, Regulation / control
   • https://doi.org…ce.285.5426.418

9. allophycocyanin(English)

10. activated protein C(English)

    • RhAPC, CAT, CTI, DOAC, ETP, INR, PPP, PRP, TF, TM, VKA, PC
    • Thrombocyte /thrombosis
    • https://doi.org…/s-0038-1672183

11. aerobic plate count(English)

    • a generic test for organisms that grow aerobically at mesophilic temperatures (25 to 40°C)
    • DMC, SPC
    • Bacteriology, Microbiology, Food microbiology
    • https://www.fda…bic-plate-count

12. author publication charge(English)

    • also as article processing charge
    • OA
    • Biomedical journals, Financial issues
    • https://doi.org…-9741-2021-0289

13. arthroprosthetic cobaltism(English)

14. atherosclerotic plaque characteristic(English)

    • LAP
    • Hemodynamics, Cardiology

15. annual percent rate change(English)

    • AAPC

16. adverse plaque characteristic(English)

    • Coronary circulation
    • https://imaging…ontent/13/3/746

17. argon plasma coagulation(English)

    • has gained importance in gastrointestinal endoscopy, and its technology has improved over time
    • Gastroenterology
    • https://doi.org…b013e32830bf825

18. attention placebo control(English)

    • considered a highly valid control condition when conducting trials of social interventions
    • E-E, COVID-19
    • Communication, Social aspects, Behavior(al science), Questionnaire, Hygiene
    • https://doi.org…063-020-04449-1

19. amino acid-polyamine [organocation](English)

    • includes five recognized families, four of which are specific for amino acids and their derivatives. Recent high-resolution X-ray crystallographic data have shown that four additional transporter families, transporting a wide range of solutes, exhibit sufficiently similar folds to suggest a common evolutionary origin
    • BCCT, MFS
    • Biochemistry
    • https://doi.org….1159/000338542

20. anteroposterior compression(English)

    • refers to open-book pelvic ring injury
    • OTA, APC-2
    • Injury, Skeleton and bone (formation)
    • https://doi.org…000000000001083

21. Article Processing Charge(English)

    • also indicated as author publication charge
    • OA
    • Biomedical journals
    • https://doi.org…46.2022.2139830
    • https://guides.…arch%20articles
    • https://doi.org…-9741-2021-0289

22. advanced process control(English)

    • refers to a broad range of techniques and technologies that interact with process control systems
    • Regulation / control, Environment
    • https://doi.org…res.2022.118924

23. average percentage change(English)

    • calculated by using the Joinpoint regression analysis to determine the trend over the study period
    • Epidemiology
    • https://doi.org…2023.24.10.3361

24. aortopulmonary collateral(English)

    • CHD, PAVM
    • Cardiology, Congenital disorders
    • https://doi.org…390/jcdd9090309

25. annual practising certificate(English)

    • Standards, Education, Specialist / expert, Dentistry, Questionnaire
    • https://doi.org…55/2018/7675917