Webster's Revised Unabridged Dictionary · 1913

Twain

Twain (twān) , adjective and noun

[Old English twein, tweien, tweyne, Anglo-Saxon twēgen, masc. See Two.]

Two; -- nearly obsolete in common discourse, but used in poetry and burlesque.
Children twain. — Chaucer
And whosoever shall compel thee to go a mile, go with him twain. — Matt. v. 41
When old winter split the rocks in twain. — Dryden