| Acronym | Definition |
|---|
| TRIS➣Tris(Hydroxymethyl)aminomethane |
| TRIS➣Tri-State |
| TRIS➣Transportation Research Information Service (US Dept. of Transportation) |
| TRIS➣Traffic and Road Information System (Canada) |
| TRIS➣Pilatus Britten-Norman BN-2A Mk III Trislander (aircraft; UK) |
| TRIS➣Toxic Chemical Release Inventory System (US EPA; also seen as TCRIS) |
| TRIS➣Trapped Ions in Space (experiment) |
| TRIS➣Telephone Routing Interactive System |
| TRIS➣Training Records Information System |
| TRIS➣Transportation Rate Information System |
| TRIS➣Training Requirements & Information System |