ETAR
| Acronym | Definition |
|---|---|
| ETAR | Estação de Tratamento de Águas Residuais (Portugal) |
| ETAR | Equivalent Tissue-Air Ratio |
| ETAR | Endothelin Type A Receptor (proteins) |
| ETAR | Eastern Thumb Association of Realtors (Port Huron, MI) |
| ETAR | Electronic Treatment Authorization Request |
| ETAR | Engineering Technical Assistance Request (Air Force) |