noun
killer yeast
A yeast strain that secretes a toxin lethal to other, sensitive yeast strains. Used in brewing and winemaking to suppress wild yeasts.
キラー酵母は、ワイン醸造で野生酵母の繁殖を抑えるために使われる。
Killer yeast is used in winemaking to suppress the growth of wild yeasts.
From English 'killer' + 酵母 (kōbo, 'yeast'). The term describes yeast strains that produce a toxin ('killer factor') that kills competing yeast.