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arsenate an ester or salt of arsenic acid.
arsenic a tasteless, odorless, extremely poisonous white compound of arsenic and oxygen, used as a pesticide; arsenous acid; arsenic trioxide. [1/2 definitions]
arsenical composed of or involving arsenic. [2 definitions]
arsenide a compound containing arsenic and one or more less electronegative elements.
arsenious composed of or involving arsenic, esp. in its trivalent state.
As symbol of the chemical element arsenic.
ratsbane a poison for rats, esp. arsenic trioxide.
realgar the orange-red mineral, arsenic sulfide, used in fireworks and as a pigment.