contaminant

[kuhn-tam-uh-nuhnt]
noun
something that contaminates.

Origin:
1920–25; < Latin contāminant- (stem of contāmināns), present participle of contāmināre. See contaminate, -ant

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World English Dictionary
contaminate
 
vb
1.  to make impure, esp by touching or mixing; pollute
2.  to make radioactive by the addition of radioactive material
 
adj
3.  archaic contaminated
 
[C15: from Latin contamināre to defile; related to Latin contingere to touch]
 
con'taminable
 
adj
 
con'taminant
 
n
 
con'taminative
 
adj
 
con'taminator
 
n

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
Some scientists suspect the hemoglobin is a contaminant.
Contaminant control is intractable only if the bio reactor is open to the outside air and water supply, as in a pond.
They are also moved as a contaminant in hay, grain, straw, and machinery.
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