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, now superseded in common discourse by your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. [1913 Webster
" 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."