Etymology From Middle English trelis, from Anglo-Norman treslis, from Old French treille (“arbor”), from Latin trichila (“arbor", "summer house”). However, see OED which claims another Old French form referring to sackcloth, from Vulgar Latin.
1
An outdoor garden frame that can be used for partitioning a common area.
2
An outdoor garden frame that can be used to grow vines or other climbing plants.
It was a very warm evening; and the moonlight turned the Thames to an unbroken mirror of silver, and gave to the soft shadows of the shrubs, and the creepers that wound among the trellises, an appearance almost Italian.1837, L[etitia] E[lizabeth] L[andon], “A Declaration”, in Ethel Churchill: Or, The Two Brides. […], volume III, London: Henry Colburn, […], →OCLC, page 90:
Etymology From Middle English trelis, from Anglo-Norman treslis, from Old French treille (“arbor”), from Latin trichila (“arbor", "summer house”). However, see OED which claims another Old French form referring to sackcloth, from Vulgar Latin.
1
To train or arrange (plants) so that they grow against a trellis.