n. & v.
n. (in full trellis-work) a lattice or grating of light wooden or metal bars used esp. as a support for fruit-trees or creepers and often fastened against a wall.
v.tr. (trellised, trellising) 1 provide with a trellis. 2 support (a vine etc.) with a trellis.
[ ME f. OF trelis, trelice ult. f. L trilix three-ply (as TRI-, licium warp-thread) ]