arsenic

/ˈɑɹsənɪk/ · 3 syllables

Meaning

noun

1. a white powdered poisonous trioxide of arsenic; used in manufacturing glass and as a pesticide (rat poison) and weed killer
2. a very poisonous metallic element that has three allotropic forms; arsenic and arsenic compounds are used as herbicides and insecticides and various alloys; found in arsenopyrite and orpiment and realgar

Synonyms for arsenic

• arsenic trioxide
• arsenous anhydride
• arsenous oxide
• white arsenic
• ratsbane
• As
• atomic number 33