Twain \Twain\ (tw[=a]n), a. & n. [OE. twein, tweien, tweyne, AS.
   tw[=e]gen, masc. See Two.]
   Two; -- nearly obsolete in common discourse, but used in
   poetry and burlesque. "Children twain." --Chaucer.
   [1913 Webster]

         And whosoever shall compel thee to go a mile, go with
         him twain.                               --Matt. v. 41.
   [1913 Webster]

   In twain, in halves; into two parts; asunder.
      [1913 Webster]

            When old winter split the rocks in twain. --Dryden.
      [1913 Webster]

   Twain cloud. (Meteor.) Same as Cumulo-stratus.
      [1913 Webster]