combining form Etymology: International Scientific Vocabulary, probably from Spanish pico small amount, literally, peak, beak one trillionth (10 -12 ) part of , very small
PICO-
Meaning of PICO- in English
Merriam Webster. Explanatory English dictionary Merriam Webster. Толковый словарь английского языка Мерриам-Уэбстер. 2012