Webster's English Dictionary

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lysis

ly.sis \'li--s*s\ \'li--.se-z\ n or ly.ses [NL, fr. Gk, act of loosening, 
   dissolution, remission of fever, fr. lyein] pl  to loosen - more at LOSE 1: 
   the gradual decline of a disease process (as fever)  2: a process of 
   disintegration or dissolution (as of cells)