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ar·se·nic (As),

1. A metallic element, atomic no. 33, atomic wt. 74.92159; forms a number of poisonous compounds, some of which are used in medicine.
2. Denoting the element arsenic or one of its compounds, especially arsenic acid.
Synonym(s): arsenium, ratsbane
[L. arsenicum, G. arsenikon, fr. Pers. zarnik]
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All were found to have been poisoned with ratsbane. With eight victims in a small residential almshouse the finger of suspicion soon pointed to another inmate, one John Johnson, who had remained unaffected.