The Clue
One of the metalloids (7 letter answer)
The Answer
ARSENIC
Tags
Notes
The answer ARSENIC is seen occasionally, appearing about once every 800 puzzles.
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Definition
ARSENIC as a noun:
1. (arsenic, As, 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
2. (arsenic, arsenic trioxide, arsenous anhydride, arsenous oxide, white arsenic, ratsbane) = a white powdered poisonous trioxide of arsenic; used in manufacturing glass and as a pesticide (rat poison) and weed killer