arsenical

[ahr-sen-i-kuhl]
adjective
1.
containing or relating to arsenic.
noun
2.
any of a group of pesticides, drugs, or other compounds containing arsenic.

Origin:
1595–1605; arsenic + -al1

nonarsenical, adjective
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World English Dictionary
arsenical (ɑːˈsɛnɪkəl)
 
adj
1.  of or containing arsenic
 
n
2.  a drug or insecticide containing arsenic

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Medical Dictionary

arsenical ar·sen·i·cal (är-sěn'ĭ-kəl)
n.
An agent containing arsenic. adj.
Of, relating to, or containing arsenic.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Example sentences
There are no proven therapies for treating chronic arsenic toxicity or for
  preventing arsenical cancers.
Liver damage from chronic arsenical poisoning is still debated, and as yet the
  question is unanswered.
Arsenic acid was also consumed by one manufacturer of arsenical herbicides.
Another company uses arsenic acid to produce arsenical herbicides.
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