01 pref. A prefix meaning one-billionth; as, a nanogram is one-thousandth of a microgram.
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1.
A prefix meaning one-billionth; as, a nanogram is one-thousandth of a microgram.
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2.
Very small; submicroscopic; -- used to designate sizes smaller than those that would be referred to as micro-; as, nanoscale manipulations.