OLD KNOCKOUT? Crossword Clue

The most common solution for the crossword clue "OLD KNOCKOUT?" are ETHER with 5 letters.
We know 1 solutions for: OLD KNOCKOUT?
Crossword Puzzle Infos
The term 'OLD KNOCKOUT' can be solved by the crossword solution 'ETHER'. ETHER is a colorless, volatile, flammable liquid that is used as a solvent and an anesthetic. It was first synthesized in 1834 by the German chemist Valerius Cordus and has been used in medicine since the 19th century. ETHER is also used in organic chemistry as a reaction medium and as a starting material for the synthesis of other compounds.
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