Etymology
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contaminate (v.)

early 15c., "infect with a disease, defile," from Latin contaminatus, past participle of contaminare "to defile, to corrupt, to deteriorate by mingling," originally "to bring into contact," from contamen "contact; pollution," from assimilated form of com "with, together" (see con-) + *tag-, base of tangere "to touch" (from PIE root *tag- "to touch, handle"). Related: Contaminant (1934).

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Definitions of contaminate

contaminate (v.)
make impure;
Synonyms: pollute / foul
contaminate (v.)
make radioactive by adding radioactive material;
Don't drink the water--it's contaminated
From wordnet.princeton.edu