(chemistry) An industrially important and highly toxic oxide of arsenic that occurs as the mineral claudetite; formula As₂O₃ (though in liquid, gaseous and some solid forms it has molecules of the form As₄O₆).

Alternative spelling of arsenic trisulfide

(inorganic chemistry) The bright yellow sulfide of arsenic, As₂S₃, that occurs as the mineral orpiment, and has been used as a pigment

(mineralogy) The mineral arsenopyrite.

(inorganic chemistry) The binary compound of arsenic and chlorine AsCl₅

(inorganic chemistry) The inorganic salt Ca₃(AsO₄)₂ that is used as a pesticide and germicide

arsenic trioxide, arsenious acid

(politics, figuratively) The United States of America, as supplier of extensive materiel support to U.S. allies during World War II; or post-war U.S. as the manufacturer and possessor of the greatest quantity of advanced military weaponry in the world, in the service of defending democratic forms of government.

Alternative form of arsenal of democracy

A soft and waxy allotrope of arsenic.