noun
a colorless, pungent liquid used as a solvent and in the manufacture of acetic acid
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Acetic aldehyde, also known as ethanal, is a colorless liquid with a pungent odor.
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I spilled some acetic aldehyde in the lab and now the whole room smells funny.
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I accidentally knocked over the bottle of acetic aldehyde and now it stinks in here.
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His words hit me like a whiff of acetic aldehyde, sharp and unpleasant.