twain

a. & n. [ OE. twein, tweien, tweyne, AS. twēgen, 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 ]