Dictionary
nano-
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. Also,nanno-; esp. before a vowel,nan-. Also,nanno-; esp. before a vowel,nan-.Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.