atomic number 33

Noun

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

arsenic, As

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

arsenopyrite, mispickel - a silver-white or gray ore of arsenic

orpiment - a yellow mineral occuring in conjunction with realgar; an ore of arsenic

realgar - a rare soft orange mineral consisting of arsenic sulphide; an important ore of arsenic

herbicide, weed killer, weedkiller - a chemical agent that destroys plants or inhibits their growth

insect powder, insecticide - a chemical used to kill insects

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