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.
Yeastâ²iness, the state of being yeasty or frothy; Yeastâ²-plant, a small plant causing alcoholic fermentation in saccharine liquids; Yeastâ²-powâ²der, a baking powder.âadj. Yeastâ²y, like yeast: frothy, foamy: unsubstantial.