Solvent

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mid 17th century: from Latin solvent- ‘loosening, unfastening, paying’, from the verb solvere .

wiktionary

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From French solvent, from Latin solventem, accusative singular of solvens, present participle of solvō. Equivalent to solve +‎ -ent.

etymonline

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solvent (adj.)

1650s, "able to pay all one owes," from French solvent, from Latin solventem (nominative solvens), present participle of solvere "to loosen, release,accomplish, fulfill," from PIE *se-lu-, from reflexive pronoun *s(w)e- (see idiom) + root *leu- "to loosen, divide, cut apart."

solvent (n.)

"substance able to dissolve other substances," 1670s, from Latin solventem (see solvent (adj.)).