1. of, relating to, or containing arsenic, especially in its trivalent form (As³⁺)
Usage: chemistry; technical

Examples

• Arsenous oxide is a highly toxic compound used in pesticides.
• The chemist analyzed the arsenous content of the contaminated water sample.
• Arsenous acid is formed when arsenic trioxide dissolves in water.
• The laboratory tested for arsenous compounds in the soil.
• Exposure to arsenous dust poses serious health risks to workers.