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1. A structure of open latticework, especially one used as a support for vines and other climbing plants.
2. An arbor or arch made of latticework.
tr.v. trel·lised, trel·lis·ing, trel·lis·es
1. To provide (an area) with a trellis.
2. To cause or allow (a vine, for example) to grow on a trellis.

[Middle English trelis, from Old French, from Vulgar Latin *trilīcius, from Latin trilīx, trilīc-, woven with three threads : tri-, tri- + līcium, thread.]
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
References in classic literature ?
They asked questions of a handsome, black-eyed man with curly gray hair, who talked to them in a German accent, while a cheery-faced woman smiled down at them out of a trellised high window of the Swiss cottage perched on the bank.
Life folded Death; Death trellised Life; the grim god wived with youthful Life, and begat him curly-headed glories.
By three, by five they prance with pride Beyond the willow-line that sheers Over the trellised tide.
The fruit of conventionally trellised blackberry plants is harvested from both sides of the plant row and in the middle of the wide plant canopy.
The trellised plants were significantly (pless than 0.05) higher than the non-trellised in total leaf yield/hectare.
Trellised trees can be planted a lot closer together than standard plantings.