American Heritage Dictionary
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Century Dictionary
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GNU Webster's 1913
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WordNet
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Elsewhere on the web
One such building block is graphite oxide, which is often used to make graphene - a hotly studied material that scientists believe could be used to produce low-cost carbon-based transparent and flexible electronics.— innovations-report
International claims it can deal with nitrogen oxide, the target of EPA 2010 emissions standards, in-cylinder.
Nitric oxide is the key to an erection and no man will get one unless he produces enough.— Find Free Articles - ArticlesBase
The relaxation response helps the body increase nitric oxide, a compound which causes blood vessels to open, which lowers blood pressure.— Best Syndication -
Furthermore the main material required for the process is the relatively inexpensive zinc oxide which is almost completely recycled back by the end of the process.

American Heritage Dictionary (1)
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You can expect to see this word about once a week.
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