carboxide

A compound of carbon and oxygen, such as carbonyl, with some element or radical; carboxylic acid or carbon oxide.

Carboxide of potassium is a frey or black, loose pulverulent mass.

potassium carboxide

A gas composed of 10% ethylene oxide on a carrier of 90% carbon dioxide, used for sterilization.

Closure should be as airtight as possible in order to reduce leakage of carboxide to a minimum.

Also, carboxide requires a gasproof chamber to be effective.