The Collaborative International Dictionary
Fermentatively
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.
Wiktionary
fermentatively
adv. 1 In a fermentative manner 2 With regard to fermentation