| Abbreviations | Meaning |
 | AAAE | Amino Acid Activating Enzyme |
 | ECA | Ethacrynic Acid |
 | TGFA | Transforming Growth Factor Alpha; Triglyceride Fatty Acid |
 | SAM | Sulfated Acid Mucopolysaccharide |
 | VRNA | Viral Ribonucleic Acid |
 | A | Abnormal; Abortion; Absolute Temperature; Absorbance; Acceptor; Accommodation; Acetone; Acetum; Achondroplasia; Acid; Acidophil, Acidophilic; Acromion |
 | FPN | Ferric Chloride, Perchloric Acid, And Nitric Acid [solution]; Fuzzy Petri Net |
 | AP | Acid Phosphatase |
 | AGAG | Acidic Glycosaminoglycans |
 | AO | Acid Output |
 | BAO-MAO | Basal Acid Output To Maximal Acid Output [ratio] |
 | AFA | Acromegaloid Facial Appearance [syndrome]; Advanced First Aid; Alcohol-formaldehyde-acetic Acid [fixative] |
 | PNBA | P-nitrobenzoic Acid |
 | AT | Amino Acid Transporter |
 | CAAX [BOX] | Protein Segment In Which C Is Cysteine, A Is Usually But Not Always An Aliphatic Amino Acid, And X Is Methionine Or Serine |