Etymologically

Etymology and origin of the Latin word ren

Confidence
Disputed
Formation
Inherited
First attested
c. 250–184 BC Plautus, Curculio More words from the 3rd century BC
Derivations

Pronunciation

  • Classical: [ˈreːn][1]
  • Ecclesiastical: [ˈrɛn][1]

Forms

rēn m (genitive rēnis); third declension[1] An older nominative rien, plural riēnēs, appears in a fragment of Plautus quoted by Festus and in later writers.[2][3][4] The genitive plural is rēnum or rēnium.[2][5] The grammarians mostly call it masculine, some feminine.[4]

Etymology

The origin is uncertain, and several explanations have been proposed.[1][4] One derives it from Proto-Italic *hrēn and Proto-Indo-European *gʷʰrḗn (“an internal part of the body”), which would make it a cognate of Ancient Greek φρήν (phrḗn, “midriff, heart, mind”);[1] Wiktionary notes that the sound changes are uncertain, since a word-initial *gʷʰr- might rather have given ⟨fr⟩ in Latin, as in frendō.[1] Lewis and Short already compared the Greek plural φρένες (phrénes).[5]

A second explanation starts from Proto-Indo-European *srḗn (“hip, loins”), with Lithuanian strė́nos (“loins”), Latvian striena (“loins”) and Old Prussian straunay, but initial *sr- seems to have given ⟨fr⟩ in Latin, as in frīgus.[1] A third, which the TLL tentatively follows after Matasović, compares Old Irish áru (“kidney”), Welsh aren (“kidney”), Hittite ḫaḫri- and Tocharian A āriñc (“heart”), from Proto-Indo-European *h₂eh₂-r-en- (“an internal organ”).[1][4] Köbler, after Walde and Hofmann, mentions a possible link with nefrōnēs (“kidneys”).[6]

In antiquity, Lactantius reports that Varro named the kidneys from the streams (rīvī) of foul fluid that arise from them, and Isidore repeats this.[4]

Earliest recorded meaning

It is first found in Plautus, in the Curculio, meaning the kidneys.[5][6] A fragment of Plautus quoted by Festus has the older nominative rien.[2][3]

Semantic evolution

The word is nearly always plural, rēnēs, and the OLD heads it so.[2][4] It is rare in verse, used by Plautus and then from Horace on, and in prose it appears on a curse tablet of the 2nd century BC and in Cicero, who speaks of the fluids that flow from the kidneys.[4][5] Horace has kidneys “attacked by an acute disease”.[5] Pliny the Elder records rēnēs as the name of a precious stone, one of the gems named after parts of the body.[2]

It was also used of the loins, in the Vulgate's command to gird them and in Nemesianus.[5][3] In Christian Latin the reins became the seat of the feelings and of the inmost mind.[5][7] Festus says that the ancients called the kidneys nefrundinēs.[4]

Timeline

  • c. 250–184 BC – Plautus uses it of the kidneys.[5][6]
  • 81–43 BC – Cicero speaks of the fluids that flow from the kidneys.[5][4]
  • 65–8 BC – Horace writes of kidneys attacked by disease.[5]
  • 23/24–79 AD – Pliny the Elder gives it as the name of a precious stone.[2]
  • 390–406 AD – The Vulgate uses it for the loins.[5][6]

Meanings

Noun

  1. (chiefly in the plural) The kidneys.[2][5][1]
  2. The loins.[5][3]
  3. (Ecclesiastical Latin) The reins as the seat of the feelings; the inmost mind.[5][7]
  4. (plural) The name of a precious stone.[2]

Word family

Usage notes

The OLD and Lewis and Short give the word under the plural rēnēs, since the singular is almost never used outside the grammarians and glosses.[2][5][4]

References

  1. ^ a b c d e f g h i Wiktionary, the free dictionary, https://en.wiktionary.org
  2. ^ a b c d e f g h i Glare, P. G. W., ed. (2012), Oxford Latin Dictionary, 2nd ed., Oxford: Oxford University Press
  3. ^ a b c d Georges, Karl Ernst (1913–1918), Ausführliches lateinisch-deutsches Handwörterbuch, 8th ed., ed. Heinrich Georges, Hannover; Leipzig: Hahn
  4. ^ a b c d e f g h i j Thesaurus linguae Latinae (1900–), Leipzig: Teubner; Berlin: De Gruyter; open-access ed., Munich: Bayerische Akademie der Wissenschaften
  5. ^ a b c d e f g h i j k l m n o Lewis, Charlton T.; Short, Charles (1879), A Latin Dictionary, Oxford: Clarendon Press
  6. ^ a b c d Köbler, Gerhard (2010), Lateinisches Abkunfts- und Wirkungswörterbuch für Altertum und Mittelalter, online ed., koeblergerhard.de
  7. ^ a b Stelten, Leo F. (1995), Dictionary of Ecclesiastical Latin, Peabody, Mass.: Hendrickson
Cite this entry

“Ren.” Etymologically, 8 Nov. 2026, etymologically.com/la/ren. Accessed 8 Nov. 2026.

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