| Abbreviations | Meaning |
 | DMA | Dimethylarsinic Acid |
| A | Abnormal; Abortion; Absolute Temperature; Absorbance; Acceptor; Accommodation; Acetone; Acetum; Achondroplasia; Acid; Acidophil, Acidophilic; Acromion |
| PGA | Pteroylglutamic Acid |
| AFA | Acromegaloid Facial Appearance [syndrome]; Advanced First Aid; Alcohol-formaldehyde-acetic Acid [fixative] |
| DSRNA | Double-stranded Ribonucleic Acid |
| ACPC | Aminocyclopentane Carboxylic [acid] |
| MPAS | Mild Periodic Acid Schiff [reaction] |
| AFB | Acid-fast Bacillus; Aflatoxin B; Aflatoxin Biomarker; Air Fluidized Bed; Aortofemoral Bypass |
| ACPASE | Acid Phosphatase |
| MELAS | Mitochondrial Encephalomyopathy, Lactic Acidosis, And Stroke-like Symptoms [syndrome] |
| CA | Caproic Acid |
| CNBP | Cellular Nucleic Acid Binding Protein |
| OAA | Old Age Assistance; Older Americans Act; Opticians Association Of America; Oxaloacetic Acid |
| AHA | Acetohydroxamic Acid |
| ACP | Acid Phosphatase |
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