1. nitrogen mustard a toxic compound resembling mustard gas in structure
  2. tower mustard or genus Arabis: erect cress widely distributed throughout Europe
  3. indian mustard Asiatic mustard used as a potherb
  4. mithridate mustard foetid Eurasian weed having round flat pods
  5. Indian mustard leaves eaten as cooked greens
  6. nitrogen oxide any of several oxides of nitrogen formed by the action of nitric acid on oxidizable materials; present in car exhausts
  7. powdered mustard a substance such that one to three tablespoons dissolved in a glass of warm water is a homemade emetic
  8. frozen custard dessert resembling ice cream but with a boiled custard base
  9. nitrogenous of or relating to or containing nitrogen
  10. dry mustard a substance such that one to three tablespoons dissolved in a glass of warm water is a homemade emetic
  11. trigonometry the mathematics of three-sided figures and their functions
  12. white mustard Eurasian mustard cultivated for its pungent seeds
  13. table mustard pungent powder or paste prepared from ground mustard seeds
  14. hedge mustard stiffly branching Old World annual with pale yellow flowers
  15. trainmaster a railroad employer who is in charge of a railway yard
  16. nitrogen cycle the circulation of nitrogen
  17. nitrogen trichloride a yellow pungent volatile oil (trade name Agene) formerly used for bleaching and aging flour
  18. nitrogenase an enzyme of nitrogen-fixing microorganisms that catalyzes the conversion of nitrogen to ammonia
  19. nitrogenise treat with nitrogen or a nitrogen compound
  20. heterogeneous consisting of elements not of the same kind or nature