(archaic or literary) Your (informal); that belongs to you (singular).
Origin of Thy
Middle English thy "because, forwhy", shortened form of for-thy, forthy (“for that"), from Old English for þȳ [þe] (“because [that]") from for (instrumental preposition) + þȳ (“by that"), instrumental case of þæt. More at the, that.
From Middle English thi, thy (“thy"), apocopated form of thin, thyn, thine (“thy", also "thine"), from Old English þīn (“thy, thine"), from Proto-Germanic *þīnaz. More at thou.
Middle English variant of thin thine from Old English thīn tu- in Indo-European roots
From American Heritage Dictionary of the English Language, 5th Edition
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