Definition of nano- in English:

nano-

combining form

  • 1Denoting a factor of 10⁻⁹ (used in units of measurement)

    ‘nanosecond’
    1. 1.1 Submicroscopic.
      ‘nanotube’

Origin

Via Latin from Greek nanos ‘dwarf’.

Pronunciation

nano-

/ˈnanəʊ/