leaven

kohotusaine, nostatusaine

kohottaa, nostattaa

piristysruiske Any agent used to make dough rise or to have a similar effect on baked goods.
puhekieltä Anything that makes a general assimilating change in the mass.
Bible, Luke xii. 1

Beware of the leaven of the Pharisees, which is hypocrisy.

With fresh material, taxonomic conclusions are leavened by recognition that the material examined reflects the site it occupied; a herbarium packet gives one only a small fraction of the data desirable for sound conclusions. Herbarium material does not, indeed, allow one to extrapolate safely: what you see is what you get(..)

With these and the like deceivable doctrines, he leavens also his prayer.