fermentatory,a.|fəˈmɛntətərɪ| [f.Lat. type *fermentātōrius, f.fermentāre to ferment.] = fermentative 1. 1765Brownrigg in Phil.Trans. LV. 227 Liquors, which..by their fermentatory motion, generate more air than they can imbibe.1770Monthly Rev. 302 A fermentatory process is carried on in the stomach.