Main Entry: ¹trel·lis

Pronunciation: \ˈtre-ləs\

Function: noun

Etymology: Middle English trelis, from Anglo-French treleis, from Old French treille arbor, from Latin trichila summerhouse

Date: 14th century

1 : a frame of latticework used as a screen or as a support for climbing plants
2 : a construction (as a summerhouse) chiefly of latticework
3 : an arrangement that forms or gives the effect of a lattice <a trellis of interlacing streams>

— trel·lised \ˈtre-ləst\ adjective

[trellis illustration]