Where does “trelis” come from?

trelis (Middle English) comes from Anglo-Norman treslis, from Old French treille, from Latin trichila — arbor; bower.

Ancestry of “trelis”, step by step

Step	Language	Word	Meaning
1	Anglo-Norman	treslis	trellis; canvas
2	Old French	treille	arbor
3	Latin	trichila	arbor; bower

trelis — Etymology, Origin & Word History | Etymology Explorer