A solid made by polymerizing acetaldehyde, used in slug pellets and as a fuel for portable stoves.
Chemical formula: C₄H₄O₄(CH₃)₄
 Example sentencesExamples
-  Slug pellets, based on metaldehyde, are cheap and effective.
 -  Chemical slug pellets and baits that contain metaldehyde are widely available commercially, however label directions must be followed carefully.
 -  Sluggo can be used around pets and wildlife, and it remains potent for a longer time compared to metaldehyde.
 -  Either prepared slug bait sold under various trade names or dust containing metaldehyde is satisfactory.
 -  Several bait formulations of metaldehyde are labeled for use on soybean for slug control.