Nano.
nano
Nano-, a nanometer is a billionth of a meter
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The prefix for "billionth of ..." is "nano...".It's used for tiny fractions of several different units, including meter, second, farad.
The prefix "nano" = 1/1,000,000,000 indicates 10^-9 or a billionth.
The prefix for 10-9 is nano-.
"nano-"
The prefix "nano" means "billionth" or 1/1,000,000,000.
The prefix "nano" means 10-9, in other words, billionth. So, this means billionth of a meter.
'Nano' is not a noun; 'nano' is not even a word, it is a prefix meaning 'one billionth' or used informally as an extremely small part of a whole. Some words with the prefix nano- are nanosecond, nanotechnology, or nanoscale.