from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. A cyclic tetramer of acetaldehyde, commonly used as a molluscicide.

from the GNU version of the Collaborative International Dictionary of English

  • n. A white crystalline substance isomeric with, and obtained from, acetic aldehyde by polymerization, and reconvertible into the same.

from The Century Dictionary and Cyclopedia

  • n. A substance into which aldehyde is partially converted in contact with acids at a low temperature. It is a white crystalline solid.


Sorry, no etymologies found.


  • Caffeine has been found to be more effective than the chemical metaldehyde in killing slugs.

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  • The poison metaldehyde, tablets of which were left at study plots.

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  • Most molluscicides are based on methiocarb or metaldehyde.

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  • We have three other bodies which pass through similar changes, in aldehyde, metaldehyde, and etaldehyde; and, again two, in urea and cyanuret of ammonia.

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  • Removing metaldehyde was difficult, bordering on impossible to remove, even with an advanced pesticide removal plant, he noted, making blending with clean water, such as from boreholes, the only option to reduce levels, he said.

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  • The good news was that metaldehyde had been found at much reduced levels, partly due to a drier autumn but also the efforts of producers responding to the metaldehyde stewardship campaign, he noted.

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  • But metaldehyde had also been detected at low levels in some of these supplies.

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  • Miss Walton and Miss Sales called the police, who found the curry was spiked with metaldehyde - a chemical commonly used as a pesticide.

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  • The introduction of pellets with lower metaldehyde concentrations would also have helped, he added.

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  • "We need to stop exceedances taking place which will involve coming up with new ideas for reducing levels as well as continued promotion of metaldehyde best practice," said Mr Myram.

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