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1. One trillionth (10-12): picosecond.
2. Very small: picornavirus.
[Spanish pico, beak, small quantity, from Latin beccus, beak, of Celtic origin (influenced by Spanish picar, to prick).]
denoting 10–12: picofarad. Symbol: p
[from Spanish pico small quantity, odd number, peak]
a combining form meaning “one trillionth” (10−12): picogram.
[< Sp pico peak, beak, bit]
A prefix meaning one trillionth (10-12). For example, 1 picometer = 1 trillionth of a meter.