| HAM | hearing aid microphone; helical axis in motion; human albumin microsphere; human alveolar macrophage... |
|---|---|
| HAP | Handicapped Aid Program; Hazardous Air Pollutants [List]; hazardous air pollution; health alliance p... |
| HHA | health hazard appraisal; hereditary hemolytic anemia; home health agency; home health aid; hypothala... |
| ICAA | International Council on Alcohol and Addictions; Invalid Children's Aid Association |
| IOTA | information overload testing aid |