Русско-английский научно-технический словарь
примесь
см. тж. беспримесный; добавлять примесные элементы; с примесью
• Tellurium atoms were introduced as a dopant.
• Emery is a greyish black variety of corundum containing much admixed magnetite or hematite.
• Many impurities in the aggregate are lighter than the good stone or sand.