twain /ˈtwen/
  二,兩,一對
  Twain a. & n.  Two; -- nearly obsolete in common discourse, but used in poetry and burlesque. “Children twain.”
     And whosoever shall compel thee to go a mile, go with him twain.   --Matt. v. 41.
  In twain, in halves; into two parts; asunder.
     When old winter split the rocks in twain.   --Dryden.
  -- Twain cloud. Meteor. Same as Cumulo-stratus.
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  twain
       n : two items of the same kind [syn: couple, pair, twosome,
            brace, span, yoke, couplet, distich, duo, duet,
            dyad, duad]