\Thou\, pron. [Sing.: nom. {Thou}; poss. {Thy}or {Thine};
obj. {Thee}. Pl.: nom. {You}; poss. {Your}or {Yours}; 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.
      Art thou he that should come?            --Matt. xi. 3.
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.
Note: Thou is now sometimes used by the Friends, or Quakers,
      in familiar discourse, though most of them corruptly
      say thee instead of thou.

\Thou\, v. t.
To address as thou, esp. to do so in order to treat with
insolent familiarity or contempt.
      If thou thouest him some thrice, it shall not be amiss.
                                               --Shak.

\Thou\, v. i.
To use the words thou and thee in discourse after the manner
of the Friends. [R.]