Definitions for oxazineˈɒk səˌzin, -zɪn
Random House Webster's College Dictionary
ox•a•zineˈɒk səˌzin, -zɪn(n.)
any of a group of 13 compounds having the formula C4H5NO, the atoms of which are arranged in a six-membered ring.
Origin of oxazine:
Any unsaturated six-membered heterocycle containing four carbon atoms, one oxygen, one nitrogen atom and two double bonds