oxide

Most metals, when subjected to heat until they become melted, combine with oxygen of the atmosphere, and form what are called oxides.

In general, the hydroxamates are used for flotation of oxidic minerals (pyrochlore, cassiterite and ilmenite), rare-earth oxides and oxide copper minerals.

In fact, nitric oxide (not to be confused with nitrous oxide, or laughing gas) is one of our primary signalling molecules.

What made the comedian's audience laugh so uncontrollably that night was a convenient nitrous oxide leak.

Nitrous oxide stopped being used as an anaesthetic a long time ago.

The tan color of most sand beaches is the result of iron oxide, which tints quartz a light brown, and feldspar, which is brown to tan in its original form.