WordReference Random House Unabridged Dictionary of American English © 2025
pi•co•sec•ond
(pē′kə sek′ənd, pī′-),USA pronunciation n.
- Timeone trillionth of a second. Abbr.: ps, psec
- pico- + second2 1965–70
'picosecond' also found in these entries (note: many are not synonyms or translations):