1863 Fownes' Chem. (ed. 9). 494Monoxethylenamine C4H4O2, NH3. Dioxethylenamine (C4H4O2)2, NH3. 
Ibid. 578Monooxysalicylic-acid. 
1881 Nature 14 Apr. 566/1 Benzene, when acted on by..nitrogen tetroxide—N2O4—yields..monoxy-benzene—C6H4O—an isomer or metamer of quinone. 
1891 Syd. Soc. Lex. ,Monoöxybenzol. 
Ibid. ,Monoxybenzol, the same as Carbonic acid.