noun
: any of various yeasts occurring naturally in the air or on surfaces especially of fruits as distinguished from those selected and artificially cultured (as for use in brewing or baking)
noun
: any of various yeasts occurring naturally in the air or on surfaces especially of fruits as distinguished from those selected and artificially cultured (as for use in brewing or baking)
Webster's New International English Dictionary. Новый международный словарь английского языка Webster. 2012