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Of or pertaining to, or containing, arsenic; as, arsenical vapor; arsenical wall papers. Arsenical silver, an ore of silver containing arsenic.

in-white color and metallic luster, containing arsenic, sulphur, and iron; -- also called arsenical pyrites and mispickel.

Alkarsin; a colorless, poisonous, arsenical liquid, As2(CH3)4, spontaneously inflammable and possessing an intensely disagreeable odor. It is the type of a series of compounds analogous to the nitrogen compounds called hydrazines. [Written also cacodyle, and kakodyl.]

sticky paper for killing flies that feed upon or are entangled by it. -- Fly powder, an arsenical powder used to poison flies. -- Fly press, a screw press for punching, embossing, etc., operated by hand and having a heavy fly. -- Fly rail, a bracket which turns out to support the hinged leaf of a table. -- Fly rod…

Arsenical iron pyrites; arsenopyrite.

Iron pyrites, or arsenical pyrites; -- so called by the Cornish miners.