adulterant

Noun

That which adulterates, or reduces the purity of something.

Japanese Meaning

不純物 – 純度を低下させる、混入して品質を損なう物質 / 混入物 – 純度を損なうように他の物質が混ざったもの

The inspector discovered an adulterant in the shipment of olive oil, which significantly reduced its value.

検査官はオリーブ油の出荷品に不純物が混入していることを発見し、それが価値を大きく低下させた。

Sense（1）

That which adulterates, or reduces the purity of something.

With regard to the presence of opium in ale, it appears to form a very deleterious adulterant;

adulterants

（ plural ）