Webster's English Dictionary

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thine

1. thine \(')thi-n\ aj [ME thin, fr. OE thi-n] archaic  : THY - used esp. 
   before a word beginning with a vowel or h 
2. thine \'thi-n\ pn [ME thin, fr. OE thi-n, fr. thi-n thy - more at TH] 
   sing or pl in constr Y : thy one : thy ones - used without a following noun 
   as a pronoun equ ivalent in meaning to the adjective thy; used archaically 
   esp. in biblical or poetic language and still surviving in the speech of 
   Friends esp. among themselves