Ratsbane

noun

Definitions

Noun
  1. 1
    Rat poison; white arsenic. countable, uncountable

    "The Gadfly’s venom, fifty times distilled, Is mingled with the vomit of the Leech, In due proportion, and black ratsbane, which That very Rat, who, like the Pontic tyrant, Nurtures himself on poison, dare not touch;—"

  2. 2
    a white powdered poisonous trioxide of arsenic; used in manufacturing glass and as a pesticide (rat poison) and weed killer wordnet

Etymology

From rat's + bane. Compare henbane.

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