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oberon	obliquity of the ecliptic	observatory
observatory, orbiting	ocean	oceanography
ocher	octane number	oil gas
oil of bitter almond	oil of vitriol	oils
olbers, heinrich wilhelm matthaus	old red sandstone	old stone age
olefin	oleum	oligocene epoch
oligosaccharide	omicron ceti	ontogeny
oort cloud	oort, jan hendrik	cluster
chain compound	operon	ophelia
opposition	optical double	orbiting astronomical observatory
orbiting geophysical observatory	orbiting solar observatory	orchil
ordovician period	oreopithecus	organometallic chemistry
orion, in astronomy	osborn, henry fairfield	osmium
ostwald, wilhelm	ovalbumin	ovum
oxalic acid	oxidases	oxidation and reduction
oxidation number	oxidative phosphorylation	oxide
oxy group	oxygen

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