\Sol"u*ble\, a. [L. solubilis, fr. solvere, solutum, to
loosen, to dissolve: cf. F. soluble. See {Solve}, and cf.
{Solvable}.]
1. Susceptible of being dissolved in a fluid; capable of
   solution; as, some substances are soluble in alcohol which
   are not soluble in water.
         Sugar is . . . soluble in water and fusible in fire.
                                               --Arbuthnot.
2. Susceptible of being solved; as, a soluble algebraic
   problem; susceptible of being disentangled, unraveled, or
   explained; as, the mystery is perhaps soluble. ``More
   soluble is this knot.'' --Tennyson.
3. Relaxed; open or readily opened. [R.] ``The bowels must be
   kept soluble.'' --Dunglison.
{Soluble glass}. (Chem.) See under {Glass}.