Rontogram

noun

noun ·Rare ·Advanced level

Definitions

Noun
  1. 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."

Example

More examples

"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."

Etymology

From ronto- + gram.

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Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.