Meaning of yeast in English
Noun
1.
(a) a type of fungus used for making bread rise or for making alcohol drinks; yeast plant
(b) the yellowish foam or froth, e.g. on beer, consisting of yeast cells and carbon dioxide; (β) any foam or froth, e.g. on sea waves
(c) a cake or sweet bread containing yeast as a leavening agent; yeast cake
2.
(a) something that causes agiation or excitenemt
(b) a state of agitation or excitement; ferment