The Collaborative International Dictionary of English v.0.48:

Diffarreation \Dif*far`re*a"tion\, n. [L. diffarreatio; dif- =
   farreum a spelt cake. See Confarreation.]
   A form of divorce, among the ancient Romans, in which a cake
   was used. See Confarreation.
   [1913 Webster]