ratsbane

Estimated CEFR level: C2 — Proficiency

Estimated from word frequency; not an official CEFR classification.

Definition

  1. noun a white powdered poisonous trioxide of arsenic; used in manufacturing glass and as a pesticide (rat poison) and weed killer

Etymology

From rat's + bane. Compare henbane.

In classic literature

Synonyms

arsenic, arsenic trioxide, arsenous anhydride, arsenous oxide, white arsenic

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