The Collaborative International Dictionary of English v.0.48:
Treillage \Treil"lage\, n. [F. treillage. See Trellis.] Latticework for supporting vines, etc.; an espalier; a trellis. --Spectator. [1913 Webster] I shall plant the roses against my treillage to-morrow. --Walpole. [1913 Webster]WordNet (r) 3.0 (2006):
treillage n 1: latticework used to support climbing plants [syn: trellis, treillage]