Might mean (unverified): Unit of length, one sextillionth meter.
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We found 2 dictionaries that define the word zeptometer:

General (2 matching dictionaries)
  1. zeptometer: Wiktionary
  2. Zeptometer: Wikipedia, the Free Encyclopedia

Definitions from Wiktionary (Zeptometer)

noun:  US spelling of zeptometre [10⁻²¹ of a metre. Symbol: zm]

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