(الْخبث) مَا يَنْفِيه الْكِير من الْحَدِيد وَنَحْوه عِنْد إحمائه وطرقه وَفِي الحَدِيث (إِن الْحمى تَنْفِي الذُّنُوب كَمَا يَنْفِي الْكِير الْخبث) وَالنَّجس وَفِي الحَدِيث (إِذا بلغ المَاء قُلَّتَيْنِ لم يحمل خبثا) (ج) أخباث و (فِي علم الكيمياء) الشوائب المنصهرة الَّتِي تطفو على سطح الْحَدِيد المنصهر أثْنَاء تحضيره من خاماته وَبِذَلِك يُمكن فصلها (مج) وخبث البركان مَا يقذفه من حمم وَغَيره (مج)
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