| IR | APAP immediate release acetaminophen |
|---|---|
| IS | ileal segment; immediate sensitivity; immune serum; immunosuppression; impingement syndrome; incenti... |
| SIR | single isomorphous replacement; specific immune release; standardized incidence ratio; syndrome of i... |
| DIT | Diet Induced Thermogenesis = Thermic Effect of Food = Specific Dynami... |
| AMPAC | American Medical Political Action Committee |