| Subject | English | Spanish |
| chem. | arsenic tri-iodide | triyoduro de arsénico |
| chem. | arsenic tri-iodide | AsI3 |
| food.ind. | dodecyl 3, 4, 5-tri-hydroxybenzoate | galato de laurilo |
| food.ind. | dodecyl 3, 4, 5-tri-hydroxybenzoate | galato de dodecilo |
| food.ind. | dodecyl 3, 4, 5-tri-hydroxybenzoate | éster laurílico del ácido 3,4,5-trihidroxibenzoico |
| food.ind. | dodecyl 3, 4, 5-tri-hydroxybenzoate | éster n-dodecílico del ácido 3,4,5-trihidroxibenzoico |
| food.ind. | dodecyl 3, 4, 5-tri-hydroxybenzoate | éster dodecílico del ácido gálico |
| food.ind. | dodecyl 3, 4, 5-tri-hydroxybenzoate | E 312 |
| chem. | phosphorus tri-iodide | triyoduro de fósforo |
| chem. | phosphorus tri-iodide | PI3 |
| transp., mil., grnd.forc. | tri-axle | eje trídem |
| auto. | tri-coat | tres etapas |
| auto. | tri-coat | tres capas |
| transp. | tri-current traction unit | máquina motriz tricorriente |
| met. | tri-foil filler metal | metal de aportación en hojas bi- o trimetálicas |
| chem. | tri-isobutylene | triisobutileno |
| transp. | Tri-national Bodensee Shipping Committee | Comisión trinacional sobre la navegación |
| chem. | tri-normal | trinormal |
| chem. | tri potassium orthophosphate | E340 iii |
| chem. | tri potassium orthophosphate | hidrógeno-ortofosfato tripotásico |
| chem. | tri potassium orthophosphate | E340iii |
| chem. | tri potassium orthophosphate | fosfato tripotásico |
| chem. | tri-propylène | tripropileno |
| antenn. | tri-rod coupler | acoplador de triple barra |
| chem. | tri sodium orthophosphate | E339 iii |
| chem. | tri sodium orthophosphate | E339iii |
| chem. | tri sodium orthophosphate | ortofosfato trisódico |
| chem. | tri sodium orthophosphate | fosfato trisódico |
| agric. | tri-sodium phosphate PO4 NA3 | fosfato sódico |
| biol. | tri-species hybrid | híbrido terciario |
| piez. | tri-state output | salida de triple estado |
| pack. | tri-walled corrugated board | cartón ondulado triple acanalado |
| pack. | tri-walled corrugated board | cartón ondulado triple (de tres capas) |
| pack. | tri-walled corrugated board | cartón ondulado triple cara |