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Definition of Pico-
1. Prefix. In the International System of Units and other metric systems of units, multiplying the unit to which it is attached by 10?12. Symbol: p ¹
¹ Source: wiktionary.com
Medical Definition of Pico-
1. 1. Combining form meaning small. 2 (p). Prefix used in the SI and metric systems to signify one-trillionth (10-12). Synonym: bicro-. Origin: It. Piccolo (05 Mar 2000)