Pico
1.
a combining form meaning “one trillionth” (10 −12):
picogram.
prefix
1.
denoting 10–12: picofarad, p
word-forming element used in making names for very small unites of measure, 1915 (formally adopted c.1952 as a scientific prefix meaning “one trillionth”), from Spanish pico “a little over, a small balance,” literally “sharp point, beak,” of Celtic origin (cf. Gaulish beccus “beak”).
pico- pref.
Polio Information Center Online
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