English edit

 
resonant forms of formylium
 
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Etymology edit

formyl +‎ -ium

Noun edit

formylium (uncountable)

  1. A positively-charged cation with the formula HCO+, related to formaldehyde, aldehydes, and formyl.

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French edit

 
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Pronunciation edit

Noun edit

formylium m (uncountable)

  1. formylium

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