| Abbreviations | Meaning |
 | OAA | Old Age Assistance; Older Americans Act; Opticians Association Of America; Oxaloacetic Acid |
| INA | Infectious Nucleic Acid; Inferior Nasal Artery; Instrumentation Amplifier; International Neurological Association |
| IAA | Imidazoleacetic Acid |
| THF | Tetrahydrocortisone F; Tetrahydrofolate; Tetrahydrofolic [acid]; Tetrahydrofuran; Thymic Humoral Factor |
| DIDA | Diethyl Iminodiacetic Acid |
| HIDA | Tetrahydroindazolone Carboxylic Acid |
| DHA | Dehydroacetic Acid; Dehydroascorbic Acid; Dehydroepiandrosterone; Dihydroacetic Acid; Dihydroxyacetone; District Health Authority |
| MBLA | Methylbenzyl Linoleic Acid; Mouse-specific Bone-marrow-derived Lymphocyte Antigen |
| HAP | Histamine Acid Phosphate |
| ASA | Aminosalicylic Acid |
| APC | Acetylsalicylic Acid, Phenacetin, And Caffeine; Activated Protein C; Adenoidal-pharyngeal-conjunctival [agent]; Adenomatous Polyposis Coli; Allophyocyanin |
| CA | Caproic Acid |
| UDCA | Ursodeoxycholic Acid |
| VMCH | Vinyl Acetate - Maleic Acid - Vinyl Chloride Copolymer |
| DADA | Dichloroacetic Acid Diisopropylammonium Salt |
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