impurity

noun

/ɪmˈpjʊərəti/

/ɪmˈpjʊrəti/

(plural impurities)

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[countable] a substance that is present in small amounts in another substance, making it dirty or of poor quality杂质
- A filter will remove most impurities found in water.过滤器会滤掉水中的大部分杂质。
- The substance is free of impurities.这种物质不含杂质。
- The water contains impurities which make it unsuitable for drinking.这种水含有杂质，不适合饮用。
[uncountable] the state of being dirty or not pure肮脏；不纯；淫秽 opposite purity

Word Originlate Middle English: from French impurite or Latin impuritas, from impurus, from in- ‘not’ + purus ‘pure’.

TOEFL BNC: 15794 COCA: 17928

impurity

Dirty: dirty, filthy, messy...