Related Clues:

• Acrimony
• Rejoinder to "'Tis!"
• Thorn in one's side
• Contaminate, as water
• Rat poison poison
• Whodunit poison
• Scorpion product
• Witch's brew
• Staghorn, for one
• Defile
• Undoing
• Viper's weapon
• Fang output
• Contaminate
• Vitriol