Merriam-Webster Collegiate Dictionary - trellis

 I. noun  Etymology: Middle English trelis, from Anglo-French treleis, from Old French treille arbor, from Latin trichila summerhouse  Date: 14th century  1. a frame of latticework used as a screen or as a support for climbing plants  2. a construction (as a summerhouse) chiefly of latticework  3. an arrangement that forms or gives the effect of a lattice a ~ of interlacing streams  • ~ed adjective  II. transitive verb  Date: 15th century  1. to provide with a ~; especially to train (as a vine) on a ~  2. to cross or interlace on or through ; interweave