ThesaurusLegend: Synonyms Related Words Antonyms
| 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 realgarchemical 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 grey ore of arsenic 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 insect powder, insecticide - a chemical used to kill insects |
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