fermenting+substance
91leaven — n. & v. n. 1 a substance added to dough to make it ferment and rise, esp. yeast, or fermenting dough reserved for the purpose. 2 a a pervasive transforming influence (cf. Matt. 13:33). b (foll. by of) a tinge or admixture of a specified quality.… …
92leav|en — «LEHV uhn», noun, verb. –n. 1. any substance, such as yeast, that will cause fermentation and raise dough. 2. a small amount of fermenting dough kept for this purpose. 3. Figurative. an influence that, spreading silently and strongly, changes… …
