1) One billionth of a mole 
The amount of a substance equal to a billionth of a mole (a measure of the amount of a substance). Also called nM.
nanomole Additional topics are available at Nanotechnology: Index of Articles. Related 'few, small, less, little' word units: micro-; mini-; mio-, meio-; oligo-, olig-. Related 'metric' families: yotta; zetta; exa; peta; tera; giga; mega; kilo; hecto; deka; deci; centi; milli; micro; pico; femto; atto; zepto; ...
one billionth of a mole.