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The Collaborative International Dictionary
Poisonable

Poisonable \Poi"son*a*ble\, a.

  1. Capable of poisoning; poisonous. [Obs.] ``Poisonable heresies.''
    --Tooker.

  2. Capable of being poisoned.

Wiktionary
poisonable

a. 1 Capable of being poisoned. 2 (context obsolete English) poisonous