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  1. (chemistry) of, relating to, or derived from nitrogen, especially in which the valence of the nitrogen is lower than that of a corresponding nitric species
  2. (chemistry) of, or relating to nitrous acid or its derivatives
  3. (mycology, biology) having a sharp odor like ammonia or nitric acid



nitrous (uncountable)

  1. (dentistry, automotive, informal) Nitrous oxide.
  2. (automotive, informal) The system in some racing vehicles which pumps nitrous oxide into the engine to improve performance.
    • 2002, Mike Kojima, Honda/Acura Engine Performance: How to Modify D, B and H Series Honda/Acura Engines for Street and Drag Racing Performance, Penguin →ISBN, page 111
      When a shot this big is being run, it will also be necessary to pull 6-10 degrees of timing out when the nitrous is being run.
    • 2004, Simon Carless, Gaming Hacks, "O'Reilly Media, Inc." →ISBN, page 320
      To simulate nitrous, we will use a very simple approach: apply a large force to the back of the car when the nitrous is on.
    • 2013, David Vizard, David Vizard's How to Super Tune and Modify Holley Carburetors, CarTech Inc →ISBN, page 74
      When tested on a typical summer day, an engine with fuel fed by an annular discharge booster could be 10 hp less over a stepped dogleg booster, but 10 hp more when the nitrous is in operation.