1) A trellis is a structure of light bars of wood which cross each other at intervals, used as a gate, screen, window, etc.
1422 the trelys wyndowe at the somer hall, the glasse wyndows, York
1532 pro v.m les hartlattes pro trelysis, York
1616 streight saughe wodd to make trellesses
1676 pro trellises of the windows, Ripon Minster. The making of trellises was one of many woodland crafts: 1617 divers others doe lyve on my wodds ... many trellesse makers, Brandsby. It could be used as a verb: c.1520 Will’mo Caruer trelyssyng et carvyng per j diem, 6d, Ripon.