Definition of pico- in English:

pico-

combining form

  • 1(used in units of measurement) denoting a factor of 10⁻¹².

    ‘picosecond’
    1. 1.1 Very small.
      ‘picornavirus’

Origin

From Spanish pico, literally ‘beak, peak, little bit’.

Pronunciation

pico-

/ˈpiːkəʊ//ˈpʌɪkəʊ/