| Acronym | Definition |
|---|
| HDRA➣Henry Doubleday Research Association |
| HDRA➣Histoculture Drug Response Assay |
| HDRA➣High Desert Racing Association (est. 1976) |
| HDRA➣Heavy Duty Representatives Association (Elgin, IL) |
| HDRA➣Hemispherical Dielectric Resonator Antenna |
| HDRA➣Holeshot Drag Racing Association |