Dictionary.com
definitions

nitrogen tetroxide

noun Chemistry.
  1. a poisonous compound, N2O4, occurring as a colorless, water-soluble solid or liquid, dissociating into NO2: used chiefly as an oxidizer, especially in rocket fuels, as a nitrating agent, and as an intermediate in the manufacture of nitric acid.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
British Dictionary definitions for nitrogen tetroxide

nitrogen tetroxide

noun
  1. another name for dinitrogen tetroxide
  2. a brown liquefied mixture of nitrogen dioxide and dinitrogen tetroxide, used as a nitrating, bleaching, and oxidizing agent
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012