Main Entry: me·tas·ta·sis

Pronunciation: \mə-ˈtas-tə-səs\

Function: noun

Inflected Form(s): plural me·tas·ta·ses \-ˌsēz\

1 a : change of position, state, or form b : the spread of a disease-producing agency (as cancer cells or bacteria) from the initial or primary site of disease to another part of the body <metastases of breast cancer to bone—Medical Physics> ; also : the process by which such spreading occurs
2 : a secondary malignant tumor resulting from metastasis