(inorganic chemistry) The barium salt of arsenic acid, Ba₃(AsO₄)₂, formed as a precipitate when removing arsenic from water supplies.

(inorganic chemistry) A colourless oily liquid, AsCl₃, used in the synthesis of organic arsenic compounds

(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

A soft and waxy allotrope of arsenic.