| HEI | Health Effects Institute; high-energy intermediate; homogenous enzyme immunoassay; human embryonic i... |
|---|---|
| HEIR | health effects of ionizing radiation; high-energy ionizing radiation |
| HEIS | high-energy ion scattering |
| HEPA | high-efficiency particulate air [filter] |
| HEV | health and environment; hemagglutinating encephalomyelitis virus; hepatitis E virus; hepato-encephal... |