Definitions

from The American Heritage® Dictionary of the English Language, 5th Edition.

  • abbreviation zeptosecond

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • noun metrology Symbol for the zeptosecond, an SI unit of time equal to 10−21 seconds.
  • noun slang, in cartoons sleep

Etymologies

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Examples

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  • Plural of the letter z.

    December 8, 2007