WordReference Random House Unabridged Dictionary of American English © 2025
pi•co•gram
(pē′kə gram′, pī′-),USA pronunciation n.
- Weights and Measuresone trillionth of a gram. Abbr.: pg
- pico- + -gram2 1950–55
'picogram' also found in these entries (note: many are not synonyms or translations):