This site allows users to directly search the collection of freely available academically-oriented digital resources.
Research Databases: O
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OAIster
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Ocean Instruments
WHOI database of scientific instruments: how they work, what they do, and why they do it.
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Oceanic Abstracts
1981+ Marine and brackish-water environments with emphasis on non-living resources.
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Oxford English Dictionary (OED)
The OED is widely regarded as the accepted authority on the English language. It is a guide to the meaning, history, and pronunciation of 600,000 words— past and present—from across the English-speaking world.