English
exsolution
From ex- + solution.
Proto-Indo-European *lewh₁- ‘to cut off’
…
Latin solvō ‘loosen’
Latin solūtiō ‘the act of loosening or unfastening someone…’
Old French solucion ‘payment of a debt’
Middle English solucioun ‘the answer to or explanation for a problem’
English solution
Today it means
noun The process in which a solution of molten rocks separates into its constituents upon cooling
Language periods are conventional ranges, not dates for this word.
Etymograph / exsolution