D defs.my
Entry 1 sense Webster, 1913

Thine

/(t͟hīn)/ · IPA /ðaɪn/
01 pron. & a. A form of the possessive case of the pronoun thou, now superseded in common discourse by your, the possessive of you, but maintaining a pla…
  1. 1.
    A form of the possessive case of the pronoun thou, now superseded in common discourse by your, the possessive of you, but maintaining a place in solemn discourse, in poetry, and in the usual language of the Friends, or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.