pico-

a combining form meaning “one trillionth” (10 −12 ): picogram.

Origin:
< Spanish pico peak, beak, bit. See pic2

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
Cite This Source Link To Pico
Collins
World English Dictionary
pico-
 
prefix
p denoting 10--12: picofarad
 
[from Spanish pico small quantity, odd number, peak]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
Cite This Source
Etymonline
Word Origin & History

pico-
1915, adopted c.1952 as a scientific prefix meaning "one trillionth," from Sp. pico "a little over, a small balance," lit. "sharp point, beak," of Celtic origin (cf. Gaul. beccus "beak"). Picosecond first recorded 1966.
Online Etymology Dictionary, © 2010 Douglas Harper
Cite This Source
American Heritage
Medical Dictionary

pico- pref.

  1. One-trillionth (10-12): picogram.

  2. Very small: picornavirus.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
Cite This Source
American Heritage
Abbreviations & Acronyms
PICO
Polio Information Center Online
The American Heritage® Abbreviations Dictionary, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
Cite This Source
Example sentences
Pico projectors will eventually be incorporated and then laptop projectors will be largely gone.
Copyright © 2014 Dictionary.com, LLC. All rights reserved.
  • Please Login or Sign Up to use the Recent Searches feature