atomic number 33
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|Noun||1.||atomic number 33 - 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|
chemical element, element - any of the more than 100 known substances (of which 92 occur naturally) that cannot be separated into simpler substances and that singly or in combination constitute all matter
orpiment - a yellow mineral occurring in conjunction with realgar; an ore of arsenic
realgar - a rare soft orange mineral consisting of arsenic sulphide; an important ore of arsenic