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cross-contamination

noun [U]
 
 
/ˌkrɒs.kən.tæm.ɪˈneɪ.ʃən/ US  /ˈkrɑːs-/

Definition

the process by which a substance that is harmful or dirty spreads from one area to anotherSpreading and scattering
(Definition of cross-contamination noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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