Webster's English Dictionary

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trellis

1. trel.lis \'trel-*s\ n [ME trelis, fr. MF treliz fabric of coarse weave, 
   trellis, fr. (ass]umed) VL trilicius woven with triple thread, fr. L tri- + 
   liceum thread 1: a frame of latticework  2: a construction of latticework  
   3: an arrangement that forms a lattice 
2. trellis vt 1: to provide with a trellis; esp : to train (as a vine) on a 
   trel lis 2: to cross or interlace on or through : INTERWEAVE