1. A drug or agent, the effect of which depends on its arsenic content. 2. Denoting or containing arsenic.
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ar·sen·i·cal är-'sen-i-kəl adj of, relating to, containing, or caused by arsenic <an \arsenical drug> <\arsenical poisoning>
arsenical n a compound or preparation containing arsenic
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ar·sen·i·cal (ahr-senґĭ-kəl) [L. arsenicalis] 1. pertaining to or containing arsenic. 2. a drug or other compound (such as a pesticide) containing arsenic; all arsenicals are toxic and some are carcinogenic.Medical dictionary. 2011.