n. A structure of light cross-bars, as of wood, nailed together where they cross one another, or of thin ribbons of metal, or of wire imitating this.n. A shed, canopy, summer-house, or the like composed, or partly composed, of trellis-work. Such buildings are utilized especially for the support of growing vines.n. In heraldry, same as treille or lattice, 3.To furnish with trellises or trellis-work; especially, to support or train on trellises: as, to trellis a vine.To form into trellis-work; interlace; interweave.