zettahertz

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Related to zettahertz: petahertz

zet·ta·hertz

(zĕt′ə-hûrts′)

n. Abbr. ZHz

One sextillion (10²¹) hertz.

American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.