Meaning

noun recuperation in which the symptoms of an acute disease gradually subside

noun (biochemistry) dissolution or destruction of cells such as blood cells or bacteria

originEtymology tree Proto-Indo-European *lewh₁-der. Ancient Greek λύω (lúō) Proto-Indo-European *-tis Ancient Greek -τις (-tis) Ancient Greek -σις (-sis) Ancient Greek λῠ́σῐς (lŭ́sĭs)der. Latin lysisbor. English lysis From Latin lysis, from Ancient Greek λύσις (lúsis, “a loosening”). Compare -lysis.

Etymology from Wiktionary, CC BY-SA 3.0