Word.ws English Dictionary

rontogram

rontogram noun: an SI unit of mass equal to 10⁻²⁷ grams. Symbol: rg.

Noun

rontogram (plural rontograms)

  1. An SI unit of mass equal to 10⁻²⁷ grams. Symbol: rg
    • The arrival of the new prefixes means the Earth can now be said to weigh six ronnagrams, and Jupiter about two quettagrams. An electron weighs about a rontogram, and a single bit of data stored on a mobile phone adds about 10 quectograms to its mass.2022 November 18, Ian Sample, “Earth weighs in at six ronnagrams as new prefixes picked for big and small”, in The Guardian
    • Earth’s mass is on the order of a ronnagram, and an electron’s mass is about one rontogram.2023 January 23, Elizabeth Gibney, “How many yottabytes in a quettabyte? Extreme numbers get new names”, in Nature, →DOI

Forms of rontogram

pluralrontograms
alternative UKrontogramme

Origin of rontogram

From ronto- + gram.

Questions about rontogram

What does rontogram mean?
Rontogram means an SI unit of mass equal to 10⁻²⁷ grams. Symbol: rg.
What part of speech is rontogram?
Rontogram is a noun.
What is the plural of rontogram?
The plural of rontogram is rontograms.

Words near rontogram in the dictionary

  1. Rontgen radiation
  2. Rontgen ray
  3. rontgenite
  4. rontgenites
  5. ronto-
  6. rontogram
  7. rontogramme
  8. rontogrammes
  9. rontograms
  10. rontosecond
  11. rontoseconds

Source and license

Adapted from Wiktionary: rontogram (page history and authors). Text available under the Creative Commons Attribution-ShareAlike 4.0 license. Word.ws reformatted the entry and added links. Wiktionary data of 2026-09-02.

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Cite this entry: “rontogram.” Word.ws, https://word.ws/rontogram. Based on Wiktionary, CC BY-SA 4.0.