1. One trillionth 10^(-12)

Encyclopedia: Pico-

• protective embankment
• protective fold
• protective garment
• protective tariff
• protectively
• protectiveness
• protector
• outstation
• outstay
• outstretch
• outstretched
• outstrip
• outstroke
• outswinger
• outtake
• outthrust
• outturn
• outvie
• outvote
• outwait
• outward
• outward-bound
• outward-developing
• outward-moving
• outwardly