micrometastasis

noun
mi·​cro·​me·​tas·​ta·​sis | \ˌmī-krō-mə-ˈtas-tə-səs \
plural micrometastases\ -​ˌsēz \

Medical Definition of micrometastasis 

: the spread of cancer cells from a primary site and the formation of microscopic tumors at secondary sites also : one of those microscopic tumors resulting from micrometastasis

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