Might mean (unverified): Simplest ketene, acetylene-derived organic compound.
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We found 2 dictionaries that define the word ethenone:

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  1. ethenone: Wiktionary
  2. Ethenone: Wikipedia, the Free Encyclopedia

Definitions from Wiktionary (ethenone)

noun:  (organic chemistry) The simplest ketene, of formula CH₂=C=O

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