Definition of trellis noun from the Oxford Advanced Learner's Dictionary

 

trellis

 noun
noun
BrE BrE//ˈtrelɪs//
 
; NAmE NAmE//ˈtrelɪs//
 
[countable, uncountable] In the garden
 
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a light frame made of long narrow pieces of wood that cross each other, used to support climbing plants See related entries: In the garden Word Origin late Middle English (denoting any latticed screen): from Old French trelis, from Latin trilix ‘three-ply’, from tri- ‘three’ + licium ‘warp thread’. Current senses date from the early 16th cent.
See the Oxford Advanced American Dictionary entry: trellis