The bivalent R-O-R functional group found in ethers.

A mixture of oxygen and acetylene; burns at a high temperature and is used for cutting and welding metals.

A synthetic analgesic drug (trademark OxyContin) that is similar to morphine in its effects.

The chemical element (symbol O) with an atomic number of 8 and relative atomic mass of 15.9994. It is a colorless and odorless gas.

Molecular oxygen (O2), a colorless, odorless gas at room temperature, also called dioxygen.

A mixture of oxygen and other gases, administered to a patient to help them breathe.

An atom of this element.