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Wiktionary
picogram

n. A unit of mass equal to 0.000 000 000 001 grams. Symbol: pg

Usage examples of "picogram".

Femtograms, picograms, nanograms of matter coalesced in a space too small to measure.

How can this living disorder coexist with the fantasy world of nanosecond measurements and picogram quantities?

I only had a few picograms left, so I had to make every run of my experiment count.