| 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) |