Trellis \Trel"lis\, n. [OE. relis, F. treillis, fr. treille vine arbor, fr. L. tricla, triclea, triclia, a bower, arbor, summer house.]

A structure or frame of crossbarred work, or latticework, used for various purposes, as for screens or for supporting plants.

Source: Webster's Revised Unabridged Dictionary (1913)