WordWeb Online

1. (of a substance) capable of being dissolved in some solvent (usually water)
    
2. Susceptible of solution or of being solved or explained
   "the puzzle is soluble"

See also: alcohol-soluble, answerable, disintegrable, dissoluble, dissolvable, explicable, fat-soluble, meltable, oil-soluble, resolvable, solubility, solubleness, solvable, water-soluble

Antonym: insoluble

Encyclopedia: Soluble