Etymologically

Etymology and origin of the Portuguese word ruído

Confidence
Established
Formation
Inherited
First attested
1200s spelt rruido More words from the 13th century
Inherited from
Latin rugitus
Ultimate origin
Latin rūgiō
Etymology tree
inherited borrowed derived
Latin rūgiō
Italian ruggire
Portuguese rugir
Romanian rugi
Latin rū̆gītus
French rut
Italian ruggito
Portuguese ruído
Spanish ruido
From the same root
Italian rugghiare ← ruggire
Italian rugliare ← ruggire
Romanian ruget ← rugi

Pronunciation

  • Brazil: /ʁuˈi.du/, [huˈi.du], /ˈʁwi.du/[1]
  • Rio-de-Janeiro: /ʁuˈi.du/, [χuˈi.du], /ˈʁwi.du/[1]
  • Portugal: /ˈʁwi.du/, [ˈʁwi.ðu][1]
  • Portugal, Southern: /ˈʁwi.du/[1]

Forms

ruído m (plural ruídos)[1] Old spellings are rruido (13th century), roydo, rroydo, arroydo and arruydo (14th century), and roido (15th century).[2][3][4]

Etymology

It is inherited from Latin rūgītus (“roaring”), which already meant “din” in Vulgar Latin; the oldest texts write Old Galician-Portuguese rruido.[3][2][5][1] The Latin noun is an action noun of rūgiō (“to roar, bellow”), the source of the Portuguese verb rugir.[3][1][6] The learned rugido “roar” is its doublet.[1]

The same Latin noun is Galician ruído, Spanish ruido, Old French ruit, Italian ruggito and Romanian ruget.[7][1] The Spanish word is first recorded as Old Spanish roído in the poem of the Cid.[8]

De Vaan compares the Latin verb with Ancient Greek ἐρεύγομαι (ereúgomai, “to roar”) and posits a root Proto-Indo-European *(H)ru- (“to roar”), to which various consonants were added.[9]

Earliest recorded meaning

Houaiss's first record is rruido, of the 13th century.[3] Lorenzo cites todo rruido from a cantiga of Estevan da Guarda, grãdes roydos “great noises” from the Crónica Geral and hũu muy grande arroydo “a very great uproar” from the Crónica de 1344.[4]

Semantic evolution

The medieval word meant both a loud noise and a commotion; the forms with a- (arroydo, arruydo) were frequent in the 14th century.[4][2] Figurative senses developed later: a rumour, a scandal or stir (fazer ruído “to cause a sensation”), and pomp or show.[3][10][11] In the 20th century the word took technical senses in acoustics, telecommunications, phonetics and medicine, among them ruído branco “white noise”.[3][5] In Rio Grande do Sul estar no ruído means to know about a matter.[12]

Timeline

  • 13th century – rruido.[3][2]
  • 14th century – roydo, rroydo and arroydo, in the Crónica Geral and the Crónica de 1344.[2][4]
  • 15th century – the spelling roido.[3]
  • 1651 – first record of the derivative ruidoso.[13]
  • 1682 – roido in a private letter.[14]

Meanings

Noun

  1. A noise caused by something falling or by bodies striking each other; a crash, a din.[3][15][1]
  2. Any confused or unharmonious sound.[3][5]
  3. A continuous, prolonged murmur; bustle (bulício): o ruído do trânsito.[3][11]
  4. (figurative) A rumour, usually unfounded.[3][10]
  5. The confused sound of many voices; an uproar, a tumult.[3][15]
  6. (figurative) A sensation, a scandal;[3][10][11] fazer ruído, to cause a stir.[3][10][11]
  7. (figurative) pomp, show, ostentation.[3][5]
  8. (acoustics) A sound made of random vibrations without harmonic relations;[3] ruído branco, white noise.[3]
  9. (communication, telecommunications) Any disturbance or unwanted signal that interferes with the transmission of a message.[3][16]
  10. (phonetics) The sound produced when the airstream is obstructed, as in consonants.[3]
  11. (medicine) A sound from an organ heard by auscultation.[3]

Word family

  • ruidoso

Usage notes

The same spelling is also the past participle of ruir “to collapse”, which has a separate source, Latin ruō.[17][1]

References

  1. ^ a b c d e f g h i j k Wiktionary, the free dictionary, https://en.wiktionary.org
  2. ^ a b c d e Cunha, Antônio Geraldo da (2010), Dicionário etimológico da língua portuguesa, 4th ed., Rio de Janeiro: Lexikon, p. s.v. ruído
  3. ^ a b c d e f g h i j k l m n o p q r s t u Houaiss, Antônio; Villar, Mauro de Salles (2001), Dicionário Houaiss da língua portuguesa, Rio de Janeiro: Objetiva, p. s.v. ruído
  4. ^ a b c d Instituto da Lingua Galega, Dicionario de dicionarios do galego medieval (DDGM), ed. Ernesto González Seoane, Santiago de Compostela: Universidade de Santiago de Compostela, https://ilg.usc.gal/ddgm, p. s.v. ruido
  5. ^ a b c d Ferreira, Aurélio Buarque de Holanda, Novo dicionário Aurélio da língua portuguesa, digital edition, p. s.v. ruído
  6. ^ Meyer-Lübke, Wilhelm (1935), Romanisches etymologisches Wörterbuch, 3rd ed., Heidelberg: Winter, p. 7428
  7. ^ García de Diego, Vicente (1985), Diccionario etimológico español e hispánico, 2nd ed., Madrid: Espasa-Calpe (1st ed. 1954)
  8. ^ Corominas, Joan; Pascual, José A. (1980–1991), Diccionario crítico etimológico castellano e hispánico, 6 vols., Madrid: Gredos, p. 5, 83
  9. ^ de Vaan, Michiel (2008), Etymological Dictionary of Latin and the other Italic Languages, Leiden Indo-European Etymological Dictionary Series 7, Leiden; Boston: Brill
  10. ^ a b c d Academia das Ciências de Lisboa, Dicionário da Língua Portuguesa, revised online edition (2023–) of the Dicionário da Língua Portuguesa Contemporânea (2001), https://dicionario.acad-ciencias.pt, p. s.v. ruído
  11. ^ a b c d Porto Editora (2013), Grande Dicionário da Língua Portuguesa, Porto: Porto Editora, p. 8200
  12. ^ Schlee, Aldyr Garcia (2019), Dicionário da Cultura Pampeana Sul-Rio-Grandense, 2 vols., Pelotas: Fructos do Paiz, p. s.v. ruído
  13. ^ Houaiss, Antônio; Villar, Mauro de Salles (2001), Dicionário Houaiss da língua portuguesa, Rio de Janeiro: Objetiva, p. s.v. ruidoso
  14. ^ CLUL (ed.) (2014), P.S. Post Scriptum: Arquivo Digital de Escrita Quotidiana em Portugal e Espanha na Época Moderna, Lisboa: Centro de Linguística da Universidade de Lisboa, http://ps.clul.ul.pt, p. s.v. ruído
  15. ^ a b Dicionário Priberam da Língua Portuguesa, Lisboa: Priberam Informática, https://dicionario.priberam.org, p. s.v. ruído
  16. ^ Aulete, Francisco Júlio Caldas, Dicionário contemporâneo da língua portuguesa (1st ed. 1881), online as Aulete Digital, Rio de Janeiro: Lexikon, https://aulete.com.br, p. s.v. ruído
  17. ^ Houaiss, Antônio; Villar, Mauro de Salles (2001), Dicionário Houaiss da língua portuguesa, Rio de Janeiro: Objetiva, p. s.v. ruir

Related etymologies

Cite this entry

“Ruído.” Etymologically, 15 Nov. 2026, etymologically.com/pt/ru%C3%ADdo. Accessed 16 Nov. 2026.

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