"Oxymethylene" is a word in ENGLISH

oxymethylene ENGLISH
Definition:

Formic aldehyde, regarded as a methylene derivative.

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formaldehyde ENGLISH

A colorless, volatile liquid, H2CO, resembling acetic or ethyl aldehyde, and chemically intermediate between methyl alcohol and formic acid.

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formyl ENGLISH

A univalent radical, H.C:O, regarded as the essential residue of formic acid and aldehyde.

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