\Thine\ ([th][imac]n), pron. & a. [OE. thin, AS.
[eth][=i]n, originally gen. of [eth]u, [eth][=u], thou; akin
to G. dein thine, Icel. [thorn]inn, possessive pron.,
[thorn][=i]n, gen. of [thorn][=u] thou, Goth. [thorn]eins,
possessive pron., [thorn]eina, gen. of [thorn]u thou. See
{Thou}, and cf. {Thy}.]
A form of the possessive case of the pronoun thou, now
superseded in common discourse by your, the possessive of
you, but maintaining a place in solemn discourse, in poetry,
and in the usual language of the Friends, or Quakers.
Note: In the old style, thine was commonly shortened to thi
      (thy) when used attributively before words beginning
      with a consonant; now, thy is used also before vowels.
      Thine is often used absolutely, the thing possessed
      being understood.