Webster's English Dictionary

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metastasis

me.tas.ta.sis \m*-'tas-t*-s*s\ \-t*-.se-z\ \.met-*-'stat-ik\ \-i-k(*-)le-\ 
   n or me.tas.ta.ses [NL, fr. LL, transition, fr. Gk, fr. methistanai to 
   change, fr. meta-)] plX + histanai to set - more at STAND : change of 
   position, state, or form : as  : transfer of a disease-producing agency 
   from the site of disease to anot her part of the body : a secondary 
   metastatic growth of a malignant tumor  - met.a.stat.ic aj