See also: rōntõ and rontó

English

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SI prefix
r Previous: quecto-
Next: yocto-
  This English term is a hot word. Its inclusion on Wiktionary is provisional.

Etymology

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Blend of r (an arbitrarily chosen initial letter) +‎ Ancient Greek ἐννέα (ennéa, nine) +‎ -to (to match the final syllable of the SI prefixes from femto- downwards).

Coined by Richard J. C. Brown and adopted by the General Conference on Weights and Measures in 2022 as an expansion to the metric prefixes beyond 10±24.

Some popular unofficial terms already in use were hella-, bronto- and xenna-, but terms beginning with the same letters as existing prefixes were considered undesirable, as were as those beginning with common scientific letters such as b or x. Richard J. C. Brown suggested that the new terms begin with r and q, due to their rarity as unit symbols, and that the trends followed by the other prefixes be continued: that they be based on Latin or Greek; that large prefixes end with -a and small prefixes end with -o; that they should be in corresponding large and small pairs; and that the first letters of each prefix should be in reverse alphabetical order (as has been the case for the newer prefixes). He therefore suggested ronna- and ronto- (evoking Ancient Greek ἐννέα (ennéa) and Latin novem (nine)), and quecca- and quecto- (evoking Ancient Greek δέκα (déka) and Latin decem (ten)), because as 1027 and 1030 when written have nine and ten groups of zeroes, respectively. These were adopted, with quecca- changed to quetta-.[1][2]

Pronunciation

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Prefix

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ronto-

  1. In the International System of Units and other metric systems of units, multiplying the unit to which it is attached by 10−27 (short scale octillionth or long scale quadrilliardth). Symbol: r
    Synonym: xenno-
    Antonym: ronna-

Derived terms

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Translations

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References

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Further reading

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