| Abbreviation | Definition |
|---|---|
| APB | Acid Producing Bacteria |
| APC | Acetylsalicylic acid ,Phenacetin, Caffeine |
| APC | Acetylsalicylic acid, Phenacetin, Caffeine |
| APCC | American Potash and Chemical Company |
| APCI | Atmospheric Pressure Chemical Ionization |
| APCI | Atmospheric-Pressure Chemical Ionization |
| APCIMS | Atmospheric Pressure Chemical Ionization Mass Spectrometry |
| APCVD | Atmosphere Pressure Chemical Vapor Deposition |
| APCVD | Atmospheric Pressure Chemical Vapour Deposition |
| APDC | Association for Professional Development in Chemistry |
| APEO | alkylphenol ethoxylates |
| API | Aromatic PolyImide |
| APIOS | Acid Precipitation In Ontario Study |
| APP | amyloid precursor protein |
| APP | Atactic Poly Propylene |
| APP | Average Physical Product |
| APPMT | Applied Photon Processing and Measurement Technology |
| APR | Air Purifying Respirator |
| APS | Anti-Pressure Surge |
| APS | Autologous Protein Solution |