Definition of "yeast" in English

noun

1. An often humid, yellowish froth produced by fermenting malt worts, and used to brew beer, leaven bread, and also used in certain medicines.

2. A single-celled fungus of a wide variety of taxonomic families.

3. (figuratively) A frothy foam.

verb

1. To ferment.

2. (of something prepared with a yeasted dough) To rise.

3. (African-American Vernacular, slang) To exaggerate.