Longman Dictionary of Contemporary English homepage

Date: 1300-1400
Language: Old French
Origin: Late Latin solubilis, from Latin solvere; SOLVE

soluble

 adjective
     
sol‧u‧ble
1 a soluble substance can be dissolved in a liquid:
soluble aspirin
water-soluble (=that can be dissolved in water)
2 formal a problem that is soluble can be solved [≠ insoluble]
—solubility noun [uncountable]
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.
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