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oxazine

[ok-suh-zeen, -zin]
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noun Chemistry.
  1. any of a group of 13 compounds having the formula C4H5NO, the atoms of which are arranged in a six-membered ring.
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Origin of oxazine

First recorded in 1895–1900; ox- + azine
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
British Dictionary definitions for oxazine

oxazine

noun
  1. any of 13 heterocyclic compounds with the formula C 4 H 5 NO
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Word Origin

from oxy- ² + azine
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