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Answer for the clue "A pungent colorless unsaturated liquid aldehyde made from propene ", 8 letters:
acrolein

Word definitions for acrolein in dictionaries

Wiktionary Word definitions in Wiktionary
n. (context organic compound English) A pungent, acrid, poisonous liquid aldehyde, CH 2 =CH-CH=O, made by the destructive distillation of glycerol.

Wikipedia Word definitions in Wikipedia
Acrolein (systematic name: propenal ) is the simplest unsaturated aldehyde . It is a colourless liquid with a piercing, disagreeable, acrid smell. The smell of burnt fat (as when cooking oil is heated to its smoke point ) is caused by glycerol in the burning ...

The Collaborative International Dictionary Word definitions in The Collaborative International Dictionary
Acrolein \A*cro"le*in\, n. [L. acer sharp + ol[=e]re to smell.] (Chem.) A limpid, colorless, highly volatile liquid, obtained by the dehydration of glycerin, or the destructive distillation of neutral fats containing glycerin. Its vapors are intensely irritating. ...

WordNet Word definitions in WordNet
n. a pungent colorless unsaturated liquid aldehyde made from propene [syn: propenal ]