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]