nano- \nan"o-\ (n[a^]n"[-o]-), pref.
1. A prefix meaning one-billionth; as, a nanogram is
one-thousandth of a microgram.
[PJC]
2. Very small; submicroscopic; -- used to designate sizes
smaller than those that would be referred to as micro-;
as, nanoscale manipulations.
[PJC]
Source: The Collaborative International Dictionary of English v.0.48
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