[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
late Middle English: from French impurite or Latin impuritas, from impurus (see impure)