noun
mixture; impurity; adulteration
Refers to something mixed in, often unwanted or of lower quality, such as impurities in a substance or foreign matter in food.
この小麦粉には混じり物が入っているかもしれない。
This flour might contain impurities.
混じり物のない純粋な金を探して
I'm looking for pure gold without any mixture.
Compound of 混じり (majiri, 'mixing', from verb 混じる majiru) + 物 (mono, 'thing').