ox·ide 
(ŏksīd′)
(ŏksīd′)n.
Divalent anionic oxygen, or a compound of oxygen, especially a binary compound of oxygen with a more electropositive element.
[French : ox(ygène), oxygen; see OXYGEN + (ac)ide, acid (from Latin acidus, tart, acid; see ACID).]
ox·idic (ŏk-sĭdĭk) adj.