Etymologically

Etymology and origin of the Latin word rabiosus

Confidence
Established
Formation
Derivation
First attested
c. 250–184 BC, Plautus
Ultimate origin
Latin rabiō
Etymology tree
inherited borrowed derived
Latin rabies
Latin rabiosus
From the same root
Latin rabidus ← rabies

Pronunciation

  • Classical: [ra.biˈoː.sʊs][1]
  • Ecclesiastical: [ra.biˈɔː.s̬us][1]

Forms

rabiōsus (feminine rabiōsa, neuter rabiōsum, adverb rabiōsē); first/second-declension adjective[1]

Etymology

It is from Latin rabiēs (“madness, rage”) + -ōsus.[2][1][3] The noun rabiēs belongs to rabiō (“to rave”),[4][5] which de Vaan traces to Proto-Italic *rab- or *raf-; its further origin is unclear.[4] He finds Schrijver's comparison with Ancient Greek ἔραμαι (éramai, “to desire, love”) unconvincing in meaning, and mentions the link with Parthian rf- (“to attack”) proposed in LIV.[4]

Earliest recorded meaning

Plautus is the first author:[5] in the Menaechmi a man is said to call his wife a rabid bitch, and in the Captivi someone was held to be raving mad.[2][6][7]

Semantic evolution

It meant rabid, of dogs, in Horace, Celsus, Scribonius Largus and Pliny the Elder,[6][8] and raving mad, of persons.[2][6] More widely it meant furious or frenzied: Cicero warns that courage must not be rabid,[7][8] Seneca lists it among the kinds of anger,[2][6] Petronius uses it of a wild, barbarous voice and of the hissing of the sacred geese,[8] and Lactantius of ravening wolves.[6] Augustine writes that a rabid dog makes a man it bites rabid by contagion.[6] Lewis and Short call it rare but classical.[8]

British Medieval Latin used it of raging animals and conduct, and in heraldry for a lion rampant.[9] It survives in Italian rabbioso.[7]

Timeline

  • c. 250–184 BC – Plautus uses it of a rabid dog and of a madman.[2][5]
  • 81–43 BC – Cicero uses it of a frenzied kind of courage.[7][8][5]
  • 65–8 BC – Horace uses it of a rabid bitch.[8][6][5]
  • 4 BC–65 AD – Seneca lists it among the kinds of anger.[2][5]
  • before 66 AD – Petronius uses it of a wild voice.[8][5]
  • 354–430 AD – Augustine uses it of rabies passed on by a bite.[6][5]

Meanings

Adjective

  1. (of dogs) rabid, mad.[2][6]
  2. (of persons) Raving mad, lunatic.[2][6]
  3. Furious, frenzied, raging.[2][8]
  4. (Medieval Latin, heraldry) Rampant.[9]

Word family

  • rabiōsulus

References

  1. ^ a b c d 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. ^ Thesaurus linguae Latinae (1900–), Leipzig: Teubner; Berlin: De Gruyter; open-access ed., Munich: Bayerische Akademie der Wissenschaften
  4. ^ a b c de Vaan, Michiel (2008), Etymological Dictionary of Latin and the other Italic Languages, Leiden Indo-European Etymological Dictionary Series 7, Leiden; Boston: Brill
  5. ^ a b c d e f g h Köbler, Gerhard (2010), Lateinisches Abkunfts- und Wirkungswörterbuch für Altertum und Mittelalter, online ed., koeblergerhard.de
  6. ^ a b c d e f g h i j Georges, Karl Ernst (1913–1918), Ausführliches lateinisch-deutsches Handwörterbuch, 8th ed., ed. Heinrich Georges, Hannover; Leipzig: Hahn
  7. ^ a b c d Conte, Gian Biagio; Pianezzola, Emilio; Ranucci, Giuliano (2010), il Latino: Vocabolario della lingua latina, 3rd ed., Florence: Le Monnier
  8. ^ a b c d e f g h Lewis, Charlton T.; Short, Charles (1879), A Latin Dictionary, Oxford: Clarendon Press
  9. ^ a b Latham, R. E., D. R. Howlett, R. K. Ashdowne, et al. (1975–2013), Dictionary of Medieval Latin from British Sources, London: British Academy / Oxford University Press
Cite this entry

“Rabiosus.” Etymologically, 20 Oct. 2026, etymologically.com/la/rabiosus. Accessed 23 Oct. 2026.

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