1) Vacuum tube
Found on
https://www.crosswordclues.com/clue/aquadag
Aquadag is a trade name for a graphite-based coating commonly found in cathode ray tubes. It is manufactured by Acheson Industries, a subsidiary of ICI. The name is a shortened form of `Aqueous Deflocculated Acheson Graphite`. Other related products include Oildag, Electrodag and Molydag. The product names are often printed with DAG in upper cas.....
Found on
http://en.wikipedia.org/wiki/Aquadag
a colloidal suspension of graphite in water, used as a conductor and lubricant.
Found on
https://www.infoplease.com/dictionary/aquadag
No exact match found.
