The Collaborative International Dictionary of English v.0.48:

Conferruminate \Con`fer*ru"mi*nate\, Conferruminated
\Con`fer*ru"mi*na`ted\, a. [L. conferruminare to cement. See
   Ferruminate.] (Bot.)
   Closely united by the coalescence, or sticking together, of
   contiguous faces, as in the case of the cotyledons of the
   live-oak acorn.
   [1913 Webster]