What is comtaminant?

Answer 1

A contaminant is an entity with some type of corruption that would interfere with the cleanliness or pristine nature of a material which could be ruined by the addition of some type of contaminant.

Answer 2

A contaminant is any substance that is unwanted or undesired in a particular environment. It can be a pollutant in air, water, soil, or food that can have negative effects on human health or the environment. Contaminants can come from natural sources or human activities.