Etymology
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lysis (n.)

"dissolution of cells, bacteria, etc.," 1902, from -lysis or from Latin lysis, from Greek lysis "a loosening," from lyein "to unfasten, loose, loosen, untie" (from PIE root *leu- "to loosen, divide, cut apart"). Earlier in the sense "gradual recession of a disease" (1834).

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Definitions of lysis

lysis (n.)
recuperation in which the symptoms of an acute disease gradually subside;
lysis (n.)
(biochemistry) dissolution or destruction of cells such as blood cells or bacteria;
From wordnet.princeton.edu