noun
leaven, zyme, ferment, barm, amylase, pepsin, diastase; see also catalyst, enzyme, fungus.
See yeast in Webster's New World Roget's A-Z Thesaurus II
A mass of bubbles in or on the surface of a liquid:
An agent that stimulates or precipitates a reaction, development, or change:
To form or cause to form foam:
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