impurity

impurity
(pl. -ies)
  1. [mass noun]the quality or condition of being impure
    不纯,不洁
    ■[count noun]a thing or constituent which impairs the purity of something
    杂质,混杂物
    aluminium and lead are impurities frequently found in tap water.
    铝和铅是自来水中常见的杂质。
    ■[count noun](Electronics)a trace element deliberately added to a semiconductor; a dopant
    (电子)掺杂剂
语源
  1. late Middle English: from French impurite or Latin impuritas, from impurus (see impure)
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