Fer*ment"a*tive*ly

from The Collaborative International Dictionary of English v.0.48

Fermentative \Fer*ment"a*tive\, a. [Cf. F. fermentatif.]
   Causing, or having power to cause, fermentation; produced by
   fermentation; fermenting; as, a fermentative process. --
   {Fer*ment"a*tive*ly}, adv. -- {Fer*ment"a*tive*ness}, n.
   [1913 Webster]