Used by arrangement with John Wiley & Sons, Inc.
- Capable of harming or killing by or as if by poison; toxic or venomous.
- Containing a poison.
- Marked by apparent ill will: “poisonous hate . . . in his eyes” (Ernest Hemingway).
- poiˈson·ous·ly adverb
- poiˈson·ous·ness noun
poisonous - Medical Definition