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===Etymology=== |
===Etymology=== |
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{{blend|en|r|pos1= |
{{blend|en|r|pos1=a letter assigned by reverse alphabetical order, though X, W, V, U, T and S were skipped to avoid confusion|lang2=grc|ἐννέα|t2=nine|-to|pos3=meaning "divide by"}}. |
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{{2022 SI prefixes}} |
{{2022 SI prefixes}} |
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Revision as of 10:42, 5 November 2023
English
| r | Previous: | quecto- |
|---|---|---|
| Next: | yocto- |
This English term is a hot word. Its inclusion on Wiktionary is provisional.
Etymology
Blend of r (a letter assigned by reverse alphabetical order, though X, W, V, U, T and S were skipped to avoid confusion) + Ancient Greek ἐννέα (ennéa, “nine”) + -to (meaning "divide by").
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
- Lua error in Module:parameters at line 360: Parameter 1 should be a valid language or etymology language code; the value "GenAm" is not valid. See WT:LOL and WT:LOL/E. IPA(key): /ˈɹɑn.toʊ/
Prefix
ronto-
- 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
Synonyms
- (nonstandard) xenno-
