Dictionary.com

peta-

Save This Word!

a combining form used in the names of units of measure equal to one quadrillion (1015) of a given base unit: petabyte.
QUIZ
QUIZ YOURSELF ON AFFECT VS. EFFECT!
In effect, this quiz will prove whether or not you have the skills to know the difference between “affect” and “effect.”
Question 1 of 7
The rainy weather could not ________ my elated spirits on my graduation day.
Meet Grammar CoachWrite or paste your essay, email, or story into Grammar Coach and get grammar helpImprove Your Writing
Meet Grammar CoachImprove Your Writing
Write or paste your essay, email, or story into Grammar Coach and get grammar help

Origin of peta-

Origin uncertain
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2022

How to use peta- in a sentence

British Dictionary definitions for peta- (1 of 2)

Peta

abbreviation for
People for the Ethical Treatment of Animals

British Dictionary definitions for peta- (2 of 2)

peta-

prefix
denoting 10 15petametres Symbol: P

Word Origin for peta-

C20: so named because it is the SI prefix after tera-; on the model of penta-, the prefix after tetra-
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Medical definitions for peta-

peta-

pref.
One quadrillion (1015):petagram.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.

Scientific definitions for peta-

peta-

A prefix that means:
One quadrillion (1015), as in petahertz, one quadrillion hertz.
250 (that is, 1,125,899,906,842,624), which is the power of two closest to a quadrillion, as in petabyte.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
FEEDBACK