From The Collaborative International Dictionary of English v.0.48:

thou \thou\ ([th]ou), pron. [Sing.: nom. Thou; poss. Thy
   ([th][imac]) or Thine ([th][imac]n); obj. Thee
   ([th][=e]). Pl.: nom. You (y[=oo]); poss. Your (y[=oo]r)
   or Yours (y[=oo]rz); obj. You.] [OE. thou, [thorn]u, AS.
   [eth][=u], [eth]u; akin to OS. & OFries. thu, G., Dan. & Sw.
   du, Icel. [thorn][=u], Goth. [thorn]u, Russ. tui, Ir. & Gael.
   tu, W. ti, L. tu, Gr. sy`, Dor. ty`, Skr. tvam. [root]185.
   Cf. Thee, Thine, Te Deum.]
   The second personal pronoun, in the singular number, denoting
   the person addressed; thyself; the pronoun which is used in
   addressing persons in the solemn or poetical style.
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         Art thou he that should come?            --Matt. xi. 3.
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   Note: "In Old English, generally, thou is the language of a
         lord to a servant, of an equal to an equal, and
         expresses also companionship, love, permission,
         defiance, scorn, threatening: whilst ye is the language
         of a servant to a lord, and of compliment, and further
         expresses honor, submission, or entreaty." --Skeat.
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   Note: Thou is now sometimes used by the Friends, or Quakers,
         in familiar discourse, though most of them corruptly
         say thee instead of thou.
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From The Collaborative International Dictionary of English v.0.48:

Thy \Thy\, pron. [OE. thi, shortened from thin. See Thine,
   Of thee, or belonging to thee; the more common form of thine,
   possessive case of thou; -- used always attributively, and
   chiefly in the solemn or grave style, and in poetry. Thine is
   used in the predicate; as, the knife is thine. See Thine.
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         Our father which art in heaven, Hallowed be thy name.
         Thy kingdom come. Thy will be done.      --Matt. vi.
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         These are thy glorious works, Parent of good. --Milton.
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