yeast

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

A compressed cake or dried granules of this substance used for mixing with flour to make bread dough rise.

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

A true yeast or budding yeast in order Saccharomycetales.

Baker's yeast (Saccharomyces cerevisiae)

brewer's yeast, certain species of Saccharomyces, principally Saccharomyces cerevisiae and Saccharomyces carlsbergensis.

Candida, a ubiquitous fungus that can cause various kinds of infections in humans.

The resulting infection, candidiasis.

(figurative) A frothy foam.

To ferment.

To rise.

(slang) To exaggerate.