(inorganic chemistry, uncountable) The compound arsine, AsH₃

(chemistry) the cation H₂As⁺ derived from arsine / (chemistry) any organic derivative of this cation

(chemistry) the arsenic analogue of a carbene R-As:

(slang, UK, Australia, New Zealand) Placed or arranged the opposite way to the way it should be. / (slang, UK, Australia, New Zealand) Arranged in a confused or haphazard way; muddled.

(slang, UK, Australia, New Zealand) In a manner that is opposite to or the reverse of the way it should be, backwards. / (slang, UK, Australia, New Zealand) In a confused or haphazard manner.

(obsolete, inorganic chemistry) The compound arsenic trichloride.

plural of arsanylidene

(slang, British, vulgar) Indicates incredulous disapproval, contradiction or disbelief.

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

(inorganic chemistry) The acid sodium salt of arsenic acid, Na₂HAsO₄