carbon dioxide CO2

oxygen (chemistry)

lacking oxygen; anaerobic

to oxygenate; to provide oxygen complement

anaerobic

to breathe; to absorb oxygen

aerobic

anaerobic

oxyhydrogen

to cut using oxyacetylene torch

to oxidize

alkoxy (chemistry)

liquid oxygen

deoxidation

ozone (O₃)

peroxy-; peroxide (chemistry)

ethoxy (chemistry)

dioxin

oxygen concentrator

anaerobic bacteria

hydrogen peroxide (H2O2) solution

source of oxygen (of forests and nature reserves); (cliché) lungs of the planet

aerobics

(bound form) hydroxide of ...

hydroxide radical (-OH)

oxyacetylene

oxidant; oxidizing agent

mercuric oxide (HgO)

oxide

Hopcalite canister; Hopcalite cartridge

calcium oxide, CaO; (slang) (used as a substitute for 肏[cao4], since CaO resembles cào)

uranium oxide

aluminum oxide

zinc oxide

magnesium oxide MgO

oxygen atom

oxygenator

oxygen effect

alkoxy (chemistry)

methoxy (chemistry)

anoxia

ozone layer

phenoxy (chemistry)

blood oxygen level

peroxide

hyperbaric oxygen; hyperbaric oxygenation; also abbr. for 高壓氧治療|高压氧治疗[gao1 ya1 yang3 zhi4 liao2], hyperbaric therapy

nitric oxide

carbon monoxide CO

phosphorous oxychloride