Rancid

(adj.) (used of decomposing oils or fats) having a rank smell or taste usually due to a chemical change or decomposition; 'rancid butter'; 'rancid bacon' .

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• Butter already rancid can be improved by treatment with a stronger solution (8 drachms of acid to 1 gallon of water), followed by washing in pure water. 威廉K.戴维. 智者、化学家和伟大医生的秘密.
• It is equally wholesome, and while it does not have the same rich flavor, it has the advantage that it keeps better, and is not so liable to become rancid or strong. Edward W. Byrn. 十九世纪发明进展.
• Those who were not got a piece of rancid salt pork from the skipper, and cut a large, thick slice out of it. 弗兰克·刘易斯·戴尔. 爱迪生的生平和发明.
• This buttermilk contributes somewhat to the flavor, but at the same time furnishes a ferment which ultimately spoils the butter by making it rancid. Edward W. Byrn. 十九世纪发明进展.
• Why does fruit-juice produce alcohol, wine turn to vinegar, milk become sour, and butter rancid? 李贝. 西洋科学史.

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