Definition of metastasize
: to spread or grow by or as if by metastasis
First Known Use of metastasize
Medical Definition of metastasize
: to spread by metastasis <… all ten were primary brain cancers; that is, they had originated in the brain, and not metastasized there from elsewhere in the body.—Paul Brodeur, The New Yorker, 9 July 1990>
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