Acetaldehyde

/ˌæsɪtælˈdɛhaɪd/ noun

A colorless liquid organic compound with a pungent smell, formed when alcohol is broken down in the body or produced industrially for making plastics and chemicals.

From acetic acid + aldehyde. The name combines acetum (vinegar) with aldehyde, referring to its chemical structure and origin from oxidizing ethanol.

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