det
thine
thyn
det
1
Archaic form of "your", used before a vowel sound.
"Thine eyes have seen the glory."
pron
1
Archaic form of "yours".
"This land is thine, not mine."
How to Use Thine
Learner’s notesIn plain EnglishAn old-fashioned way of saying "your" or "yours", still seen in classic literature, prayers, and poetry.
When to use it
Archaic — only used today for deliberate old-fashioned or poetic effect (Shakespeare, the King James Bible, wedding vows).
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_____ eyes have seen the glory.
Etymology
From Old English þīn, the old second-person possessive — the ancestor of "your" and "yours".