Definition of tae kwon do for English Language Learners. : a style of fighting that originated in Korea and that uses kicks and punches but no weapons. Britannica.com: Encyclopedia article about tae kwon do.
It is also used in the baking process as a leavening agent; yeast releasing gas into their environment results in the spongy-like texture of breads and cakes. Because of its role in fermentation, humans have known about and used Saccharomyces cerevisiae for a long time.
Nutritional yeast, also known as savory yeast or nooch, is an inactive yeast made from sugar cane and beet molasses. In the scientific form saccharomyces cerevisiae, or sugar-eating fungus, yeast cells use the sugar for energy.