simple past tense and past participle of dissolve
"The sugar dissolved completely in the hot water when it was stirred vigorously."
In plain English: To dissolve means to mix completely into another liquid until it disappears and you can no longer see it separately.
"The sugar dissolved quickly in the hot water."
that has been disintegrated in a solvent
"The sugar dissolved completely when stirred into the hot water."
In plain English: Dissolved means something has completely mixed into another liquid until it disappears from sight, like sugar vanishing when stirred into hot tea.
"The dissolved sugar had completely vanished into the warm water."
Usage: Use this adjective to describe substances like sugar or salt that have completely mixed into a liquid until they disappear from view. It specifically refers to the physical process of integration with a solvent, distinguishing it from words meaning merely broken apart or melted down.