resolvent

adj

1. Able to resolve (separate) the constituents of a mixture

noun

1. Any substance or material able to resolve the constituents of a mixture; a solvent.
2. That which has power to disperse inflammatory or other tumours; a discutient; anything which aids the absorption of effused products.

   “astringent resolvents”

3. An equation upon whose solution the solution of a given problem depends.