zeptogram

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noun

An SI unit of mass equal to 10⁻²¹ grams. Symbol: zg

OriginEnglish gram ← Ancient Greek ἑπτᾰ́ (heptắ) ← Proto-Hellenic *heptə́ →
Scrabble 23
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Meanings

nounzeptogram (plural zeptograms)

plural zeptograms · alternative UK zeptogramme

  1. metrologyAn SI unit of mass equal to 10⁻²¹ grams. Symbol: zg

Origin

  1. Proto-Afroasiatic*sṗɣ?
  2. Proto-Semitic*šabʕ-bor.?
  3. Proto-Indo-European*septḿ̥
  4. Proto-Hellenic*heptə́
  5. Ancient Greekἑπτᾰ́ (heptắ)
  6. Englishzepto-
  7. Englishgram
  8. Englishzeptogram

From zepto- + gram.

Full word history & related roots →
Cite this entry
APA

zeptogram. (n.d.). In WatkinsX Dictionary. Retrieved November 3, 2026, from https://dictionary.watkinsx.com/word/zeptogram

MLA

“zeptogram.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/zeptogram. Accessed November 3, 2026.

Chicago

WatkinsX Dictionary, s.v. “zeptogram,” accessed November 3, 2026, https://dictionary.watkinsx.com/word/zeptogram.

Source: zeptogram on Wiktionary, CC BY-SA 4.0.