metastasis me·tas·ta·sis (mə-tās'tə-sĭs)
n. pl. me·tas·ta·ses (-sēz')
Transmission of pathogenic microorganisms or cancerous cells from an original site to one or more sites elsewhere in the body, usually by way of the blood vessels or lymphatics.
A secondary cancerous growth formed by transmission of cancerous cells from a primary growth located elsewhere in the body.