milliarcsecond

M3I1L1L1I1A1R1C3S1E1C3O1N1D2

noun

A unit of angle equal to one thousandth of an arcsecond (used especially in astronomy)

OriginEnglish arcsecond ← French milli- ← Latin mīlle →
Scrabble 21
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Meanings

nounmilliarcsecond (plural milliarcseconds)

plural milliarcseconds

  1. metrologyA unit of angle equal to one thousandth of an arcsecond (used especially in astronomy)

Origin

  1. Proto-Indo-European*sem-
  2. Proto-Indo-European*sm̥-
  3. Proto-Indo-European*smih₂
  4. Proto-Indo-European*ǵʰes-
  5. Proto-Indo-European*ǵʰéslom
  6. Proto-Indo-European*ǵʰéslih₂
  7. Proto-Indo-European*smih₂ǵʰéslih₂
  8. Proto-Italic*smīɣeslī
  9. Latinmīlle
  10. Frenchmilli-
  11. Englishmilli-
  12. Englisharcsecond
  13. Englishmilliarcsecond

From milli- + arcsecond.

Full word history & related roots →
Cite this entry
APA

milliarcsecond. (n.d.). In WatkinsX Dictionary. Retrieved November 2, 2026, from https://dictionary.watkinsx.com/word/milliarcsecond

MLA

“milliarcsecond.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/milliarcsecond. Accessed November 2, 2026.

Chicago

WatkinsX Dictionary, s.v. “milliarcsecond,” accessed November 2, 2026, https://dictionary.watkinsx.com/word/milliarcsecond.

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