The foam, or troth (top yeast), or the sediment (bottom yeast), of beer or other in fermentation, which contains the yeast plant or its spores, and under certain conditions produces fermentation in saccharine or farinaceous substances; a preparation used for raising dough for bread or cakes, and making it light and puffy; barm; ferment.

A form of fungus which grows as individual rounded cells, rather than in a mycelium, and reproduces by budding; esp. members of the orders Endomycetales and Moniliales. Some fungi may grow both as a yeast or as a mycelium, depending on the conditions of growth.

A tiny plant-like microorganism that serves as a catalyst in the process of fermentation. See Also: fermentation. process.

Unicellular fungi which reproduces by budding. A component of bowel flora capable of fermenting carbo-hydrates. Yeast thrives in a warm, dark, moist environment. Bowel flora can be disrupted by antibiotic use, stress or poor diet which can cause an overgrowth that can lead to various health problems.

Microscopic fungal organisms that thrive in warm, moist environments, including the human gastrointestinal (GI) tract. Normally harmless, intestinal yeast can overgrow as a result of antibiotic use, stress, poor diet, and other factors, triggering a wide range of health problems.

Related Topic"...Common yeast infections include candidiasis and thrush..."

A single-cell organism that may cause infection in the mouth, vagina, gastrointestinal tract, and any or all bodily parts. Common yeast infections include candidiasis and thrush.