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| The American Heritage® Dictionary of the English Language: Fourth Edition. 2000. |
| arsenic trioxide |
| SYLLABICATION: | ar·se·nic trioxide |
| PRONUNCIATION: |  är s -n k |
| NOUN: | A poisonous, white amorphous powder, As2O3, used in insecticides, rat poisons, and weed killers. |
| The American Heritage® Dictionary of the English Language, Fourth Edition. Copyright © 2000 by Houghton Mifflin Company. Published by the Houghton Mifflin Company. All rights reserved. | |
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