Etymologically

Etymology and origin of the Portuguese word piolho

Confidence
Established
Formation
Inherited
First attested
1300s Horto do Esposo, spelt peolho More words from the 14th century
Inherited from
Latin peduclus
Ultimate origin
Latin pēdis
Derivations

Pronunciation

  • Brazil: /piˈo.ʎu/, /ˈpjo.ʎu/[1]
  • Portugal: /ˈpjo.ʎu/[1]

Forms

piolho m (plural piolhos)[1] Old Portuguese wrote peolho in the 14th century, then piolho and pyolhos in the 15th.[2][3]

Etymology

It is inherited from Late Latin peduclus, from peduculus, a form of pēdīculus (“louse”), the diminutive of pēdis (“louse”).[2][3][4][1] Nascentes notes that the Latin diminutive suffix was exchanged in the popular form.[5] The same Latin word is Galician piollo, Spanish piojo, Catalan poll, French pou, Italian pidocchio and Romanian păduche.[1][6]

De Vaan reconstructs *pezd- and a Proto-Indo-European word for an annoying insect, and compares an Avestan name of an insect that harms horses.[7] Wiktionary also gives the root as *pezd-, but calls the origin of the Latin noun uncertain.[1] Aurélio connects the diminutive with pēs (“foot”), a view Wiktionary records as one of two explanations.[8][1]

Earliest recorded meaning

Cunha's earliest record is peolho in the Horto do Esposo, which he dates to the 14th century.[3] Houaiss also dates the plural peolhos to the 14th century.[2]

Semantic evolution

Cardoso, Barbosa and Pereira render the word by Latin pediculus.[9][10][11] Bluteau calls the louse the companion of poverty and the lasting guest of beggars.[12] Morais's edition of 1813 notes that in Brazil horses suffer from lice, and records the phrase meter-se como piolho em costura “to get in like a louse in a seam”, of someone who intrudes where he is not wanted.[13]

The name was extended to the plant lice, to mites and other small pests, and in Brazil to a tree and to the rêmora, a fish that clings to sharks.[2][14][15] The printers use it for a small misprint, the shoemakers for a tiny nail, and in the Azores chuva de piolho is a fine drizzling mist.[8][16][14]

Timeline

  • 14th century – peolho in the Horto do Esposo.[3]
  • 15th century – the spellings piolho and pyolhos.[2]
  • 1569 – Cardoso renders piolho by Latin pediculus.[9]
  • 1611 – Barbosa adds erva piolheira, the plant stavesacre.[10]
  • 1789 – Morais defines it as an insect bred on the head and body of unclean people.[17]
  • 1813 – meter-se como piolho em costura.[13]
  • 1858 – first record of piolhento.[3]

Meanings

Noun

  1. louse: any of the wingless insects that live as parasites on mammals and birds, especially the head louse and the body louse of humans.[2][8][1]
  2. (Brazil) A loose name for various mites and small insect pests of plants and poultry; pulgão.[2][18]
  3. (Pernambuco) The remora, rêmora.[2][15]
  4. (Brazil) A tree of the genus Casearia.[2][16]
  5. (printing) A small misprint missed in proofreading.[8][16]
  6. A small tack used by shoemakers.[19][16]
  7. (Azores) fog, fine mist.[1][14]

Word family

  • piolhento
  • piolhoso
  • piolheira
  • espiolhar
  • piolho-da-cabeça
  • piolho-de-cobra

Usage notes

Meter-se como piolho em costura means to turn up everywhere uninvited.[20][13]

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 Houaiss, Antônio; Villar, Mauro de Salles (2001), Dicionário Houaiss da língua portuguesa, Rio de Janeiro: Objetiva, p. s.v. piolho
  3. ^ a b c d e Cunha, Antônio Geraldo da (2010), Dicionário etimológico da língua portuguesa, 4th ed., Rio de Janeiro: Lexikon, p. s.v. piolho
  4. ^ Nascentes, Antenor (1966), Dicionário etimológico resumido, Rio de Janeiro: Instituto Nacional do Livro, p. s.v. piolho
  5. ^ Nascentes, Antenor (1955), Dicionário etimológico da língua portuguesa, vol. 1: Nomes comuns, Rio de Janeiro (1st ed. 1932, preface by W. Meyer-Lübke), p. 399
  6. ^ Corominas, Joan (1973), Breve diccionario etimológico de la lengua castellana, 3rd ed., Madrid: Gredos, p. s.v. piojo
  7. ^ de Vaan, Michiel (2008), Etymological Dictionary of Latin and the other Italic Languages, Leiden Indo-European Etymological Dictionary Series 7, Leiden; Boston: Brill
  8. ^ a b c d Ferreira, Aurélio Buarque de Holanda, Novo dicionário Aurélio da língua portuguesa, digital edition, p. s.v. piolho
  9. ^ a b Cardoso, Jerónimo (1569–1570), Dictionarium ex lusitanico in latinum sermonem, Lisboa: João Álvares (CLP transcription, Universidade de Aveiro), p. s.v. piolho
  10. ^ a b Barbosa, Agostinho (1611), Dictionarium lusitanicolatinum, Braga: Fructuoso Lourenço de Basto (CLP transcription, Universidade de Aveiro), p. s.v. piolho
  11. ^ Pereira, Bento (1697), Thesouro da lingoa portuguesa, in the 1697 edition of his Prosodia (1st ed. 1647; CLP transcription, Universidade de Aveiro), p. s.v. piolho
  12. ^ Bluteau, Raphael (1712–1728), Vocabulario portuguez e latino, 8 vols. + 2 supplement vols., Coimbra / Lisboa (CLP transcription, Universidade de Aveiro), p. s.v. piolho
  13. ^ a b c Silva, António de Morais (1813), Diccionario da lingua portugueza, 2nd ed., 2 vols., Lisboa: Typographia Lacerdina, p. 2, 454
  14. ^ a b c 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. piolho
  15. ^ a b Navarro, Fred (2004), Dicionário do Nordeste, São Paulo: Estação Liberdade, p. s.v. piolho
  16. ^ a b c d Michaelis: Moderno Dicionário da Língua Portuguesa, São Paulo: Melhoramentos (online as Michaelis Dicionário Brasileiro da Língua Portuguesa, https://michaelis.uol.com.br), p. s.v. piolho
  17. ^ Silva, António de Morais (1789), Diccionario da lingua portugueza composto pelo padre D. Rafael Bluteau, reformado, e accrescentado, 2 vols., Lisboa: Simão Thaddeo Ferreira, p. 2, 204
  18. ^ 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. piolho
  19. ^ Dicionário Priberam da Língua Portuguesa, Lisboa: Priberam Informática, https://dicionario.priberam.org, p. s.v. piolho
  20. ^ Porto Editora (2013), Grande Dicionário da Língua Portuguesa, Porto: Porto Editora, p. 7199

Related etymologies

Cite this entry

“Piolho.” Etymologically, 15 Nov. 2026, etymologically.com/pt/piolho. Accessed 16 Nov. 2026.

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