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Cyanide is one of the best known of all poisons. Perhaps best known as the suicide pills reputedly carried by secret agents it was also the active ingredient in the gas (Zyklon B) used by the Nazis in extermination camps such as Auschwitz.
Related Clues: 1  Poison 2  ___. Tannin source. 3  Tree with tiny red berries. 4  Poison plant. 5  It can be poisonous. 6  Shrub with red fruit. 7  Poisonous plant. 8  Cashew family member. 9  Poison ivy relative. 10  Poison ___ (irritating shrub)