Clue | Length | Answer |
---|---|---|
gets rid of impurities | 7 letters | refines |
Makes pure | 7 letters | refines |
Rejects and polishes again | 7 letters | refines |
Makes small improvements to | 7 letters | refines |
Removes impurities | 7 letters | refines |
Hones | 7 letters | refines |
Purifies, as petroleum | 7 letters | refines |
Purifies | 7 letters | refines |