Thy Definition
(archaic or literary) Your (informal); that belongs to you (singular).
Origin of Thy
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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 Wiktionary
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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.
From Wiktionary
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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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