- any of the class of poisonous, blistering compounds, as C5H11Cl2N, analogous in composition to mustard gas but containing nitrogen instead of sulfur: used in the treatment of cancer and similar diseases; mechlorethamine.
- any of a class of organic compounds resembling mustard gas in their molecular structure. General formula: RN(CH 2 CH 2 Cl) 2, where R is an organic group: important in the treatment of cancer
