- a combining form used in the names of units of measure equal to one quadrillion (1015) of a given base unit: petabyte.
Origin of peta-
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
- denoting 10 15petametres Symbol: P
C20: so named because it is the SI prefix after tera-; on the model of penta-, the prefix after tetra-
- One quadrillion (1015):petagram.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
- 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.