Definition of micro- in English:

micro-

combining form

  • 1Small.

    ‘microcar’
    1. 1.1 Of reduced or restricted size.
      ‘microdot’
  • 2(used in units of measurement) denoting a factor of one millionth (10⁻⁶)

    ‘microfarad’

Origin

From Greek mikros ‘small’.

Pronunciation

micro-

/ˈmʌɪkrəʊ/