The word 'nano' comes from ancient Greek and means 'dwarf.' Scientifically, adding 'nano' to a unit of measure means 'one billionth.' When added to the word 'meter,' as in 'nanometer,' the meaning becomes 'one billionth of a meter.' Nano cannabidiol, then, is CBD particles that have been reduced in size to the point that they can be measured in billionths of a meter!