The Collaborative International Dictionary
Atwain
Atwain \A*twain"\, adv. [OE. atwaine, atwinne; pref. a- +
twain.]
In twain; asunder. [Obs. or Poetic] ``Cuts atwain the
knots.''
--Tennyson.
Wiktionary
atwain
adv. (context archaic English) In twain; asunder.