| a combining form with the meaning “very small, minute,” used in the formation of compound words (nanoplankton); in the names of units of measure it has the specific sense “one billionth” (10-9): nanomole; nanosecond. |
A prefix meaning one billionth.
nano- pref.
Extremely small: nanoid.
One-billionth (10-9): nanometer.
nano-
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