What does acrolein mean?
The definition of acrolein
A*cro”le*in, n.
Etym: [L. acer sharp + olere 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. Watts.