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yeast (n.)

Old English gist "yeast, froth," from Proto-Germanic *jest- (source also of Old Norse jastr, Swedish jäst, Middle High German gest, German Gischt "foam, froth," Old High German jesan, German gären "to ferment"), from PIE root *yes- "to boil, foam, froth" (source also of Sanskrit yasyati "boils, seethes," Greek zein "to boil," Welsh ias "seething, foaming").

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Definitions of yeast from WordNet

yeast (n.)
a commercial leavening agent containing yeast cells; used to raise the dough in making bread and for fermenting beer or whiskey;
Synonyms: barm
yeast (n.)
any of various single-celled fungi that reproduce asexually by budding or division;
From wordnet.princeton.edu