Definition of pico- combining form from the Oxford Advanced Learner's Dictionary

 

pico-

 combining form
combining form
BrE BrE//ˈpiːkəʊ//
 
; NAmE NAmE//ˈpiːkoʊ//
 
; BrE BrE//ˈpaɪkəʊ//
 
; NAmE NAmE//ˈpaɪkoʊ//
 
 
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(in nouns; used in units of measurement) 10-12; one million millionth Word Originfrom Spanish pico, literally ‘beak, peak, little bit’.
See the Oxford Advanced American Dictionary entry: pico-