yeast powder

A substitute for yeast used in leavening bread, consisting of a preparation of soda, phosphates, and other substances, in the form of a powder. *yeast, v. i . [YEAST, 8.] To ferment. "Yeasting youth Will clear itself and crystal turn again." Keats: Otho the Great , iii. 2. yeast'-I-ne , subst. [Eng. yeasty; -ne .] The quality or state of being yeasty.