| TRE | an architectural ornament in the form of three arcs arranged in a circle |
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| TRE | a plant of the genus Trifolium |
| TRE | any of several Old World herbs of the genus Medicago having small flowers and trifoliate compound leaves |
| TRE | a pointed arch having cusps in the intrados on either side of the apex |
| TRE | latticework used to support climbing plants |
| TRE | any long and difficult trip |
| TRE | (South African) a journey by ox wagon (especially an organized migration by a group of settlers) |
| TRE | make a long and difficult journey |
| TRE | journey on foot, esp. in the mountains |
| TRE | a traveler who makes a long arduous journey (as hiking through mountainous country) |
| TRE | latticework used to support climbing plants |
| TRE | train on a trellis, as of a vine |