yotta-

yotta-

pref.

1. One septillion (10²⁴): yottahertz.

2. 1,208,925,819,614,629,174,706,176 (2⁸⁰): yottabyte.

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[Alteration of octo- (from its representing the eighth power of a thousand).]

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.

yotta-

a combining form used in the names of units of measure equal to one septillion of a given base unit: yottabyte.

[alter. of Greek iôta, ninth letter of the Greek alphabet (y is the second-to-last letter of the Latin alphabet)]

Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.