There are multiple definitions:

1. afterdepolarization(English)

   • DAD, EAD, AHP
   • Electrophysiology

2. adenosine 5'-diphosphate(English)

   • Abbreviation may be used in Am. Soc. Physiol. journals without definition.
   • ATP, ATPase
   • Physiology, Biochemistry

3. automatic data processing(English)

   • Medical informatics

4. anchored disc phenomenon(English)

   • ML, MP, MRI
   • Dentistry, Surgery
   • https://doi.org…jom.2003.10.005

5. air displacement plethysmography(English)

   • BF, BMC, BMD, BMI, DXA, FFM, HW, LBM, QA
   • Adiposity, Diet
   • https://doi.org…ocd.2025.101595