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Foreign
Pronunciation
Definition 1
In medicine, foreign describes something that comes from outside the body. A foreign substance in the body’s tissues, such as a bacterium or virus, may be recognized by the immune system as not belonging to the body. This causes an immune response. Other foreign substances in the body, such as artificial joints, are designed to not cause an immune response. (NCI Dictionary)
Definition 2
Not belonging to that in which it is contained; introduced from an outside source. (NCI Thesaurus)
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