Etymologically

Etymology and origin of the Portuguese word boi

Confidence
Established
Formation
Inherited
First attested
1200s Cantigas de Santa Maria More words from the 13th century
Inherited from
Latin bos
Ultimate origin
Proto-Indo-European *gʷṓws
Etymology tree
inherited borrowed derived
Latin bōs
Catalan bou
French bœuf
Italian bove
Italian bue
Portuguese boi
Derivations
From the same root
Latin boārius ← bōs
Latin bovīnus ← bōs
Latin bubulcus ← bōs
Latin būbulus ← bōs
Latin būcētum ← bōs
Latin būcina ← bōs
Latin būculus ← bōs
Spanish boyero ← bōs

Pronunciation

  • Brazil: /ˈboj/, [ˈboɪ̯][1]
  • Portugal: /ˈboj/[1]
  • /ˈbø/[1]

Forms

boi m (plural bois, feminine vaca, feminine plural vacas)[1] Old Galician-Portuguese wrote boi and boy.[2] Morais (1789) gives the plurals boiz and boizes from the Ordenações Manuelinas.[3]

Etymology

It is inherited from Latin bōs (“ox, cow”), written Old Galician-Portuguese boi in the oldest texts.[2][4][5][1] It continues the accusative of the Latin noun, probably through a popular form *boe, with the /v/ lost between vowels.[5][1][6] Machado compares the Latin adjective boārius (“of cattle”), where the /v/ had already gone in Latin.[5][6]

The same Latin word is Galician boi, Spanish buey, Catalan bou, French bœuf, Italian bue and Romanian bou.[7][1] The Latin noun is irregular: Wiktionary and the DHLF explain it as a borrowing from an Osco-Umbrian dialect, the expected native form being the same as vōs (“you”).[1][8] It goes back to *gʷōs and *gʷṓws, the source also of Ancient Greek βοῦς (boûs) and English cow.[1]

Earliest recorded meaning

A Latin charter of 921 has castro de bo, a place name with the Romance form of the word.[5][2] In Galician-Portuguese the word appears in the 13th century: the Cantigas de Santa Maria tell como Santa Maria levou o boi do aldeão de Segovia “how Holy Mary took the peasant of Segovia's ox” and of a man who prendeu seus bois con que lavrar fosse “yoked his oxen to go ploughing”, and Alfonso X compares people to os bois das ferradas plagued by flies.[9][4] The sense was the draught ox.[9]

Semantic evolution

Compounds on the animal appear early: the cantigas already have olho de boi, and Figueiredo (1899) lists olho de boi “round window, skylight” and pé de boi “a stolid man set in old ways”.[10][11] Silva Bastos (1912) records the boi bento, a garlanded ox that walks before the Corpus Christi procession at Caminha, and boi cavalo, a riding ox in Portuguese Africa;[12][13] Priberam places the boi bento in the Minho processions.[12][13]

In Brazil the word gained many senses: the ox of the bumba-meu-boi folk play and the play itself, a cuckold, a fat or heavy person, a prostitute, and in the north-east menstruation.[2][14][15] In Portugal it is also slang for marijuana and for a taxi passenger who gives no tip.[2]

Timeline

  • 921 – castro de bo in a Latin charter.[5]
  • 13th century – boi in the Cantigas de Santa Maria and in a cantiga d'escarnho of Alfonso X.[9][2]
  • 16th century – first record of boiada “herd of oxen”.[4]
  • 1789 – Morais gives the old plurals boiz and boizes.[3]
  • 1899 – Figueiredo lists olho de boi and pé de boi;[11][4] Cunha's first dates for aboiar and boiadeiro.[11][4]

Meanings

Noun

  1. (zoology) Any animal of the genus Bos, cattle.[2][14]
  2. An ox, a castrated bull used for draught and for meat.[2][14][16]
  3. (Brazil) The ox, chief character of the bumba-meu-boi folk play; the play itself.[2][14][15]
  4. (figurative, derogatory) A cuckold.[2][1]
  5. (derogatory) A big, heavy or fat person.[2][1]
  6. (north-eastern Brazil, informal) menstruation.[2][17][1]
  7. (Portugal, informal) marijuana.[2]

Word family

  • boiada
  • boiadeiro
  • boieiro
  • boizinho
  • aboiar
  • aboio
  • boi-cavalo
  • boi-marinho
  • peixe-boi
  • bife
  • bovídeo
  • bovino
  • Latin bōs
  • Spanish buey

Usage notes

Cunha and Houaiss record a separate boi (also boy), first in 1511: in Portuguese India a man of low trade, especially a palanquin or umbrella bearer, from Konkani bhôi;[4][2][18] Dalgado notes that in his day it survived only after a personal name.[4][2][18] Houaiss also has an Afro-Brazilian boi “pipe for marijuana”, which he explains after Cacciatore as short for boi de Oxalá, and Aurélio a boi “snake”, from Tupi mboi.[2][14]

Fixed phrases include pôr o carro à frente dos bois “to put the cart before the horse” and a passo de boi “at a snail's pace”.[16]

References

  1. ^ a b c d e f g h i j k l Wiktionary, the free dictionary, https://en.wiktionary.org
  2. ^ a b c d e f g h i j k l m n o p Houaiss, Antônio; Villar, Mauro de Salles (2001), Dicionário Houaiss da língua portuguesa, Rio de Janeiro: Objetiva, p. s.v. boi
  3. ^ a b 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. 1, 186
  4. ^ a b c d e f g Cunha, Antônio Geraldo da (2010), Dicionário etimológico da língua portuguesa, 4th ed., Rio de Janeiro: Lexikon, p. s.v. boi
  5. ^ a b c d e Machado, José Pedro (1987), Dicionário etimológico da língua portuguesa, 4th ed., 5 vols., Lisboa: Livros Horizonte, p. s.v. boi
  6. ^ a b Nascentes, Antenor (1955), Dicionário etimológico da língua portuguesa, vol. 1: Nomes comuns, Rio de Janeiro (1st ed. 1932, preface by W. Meyer-Lübke), p. s.v. boi
  7. ^ Meyer-Lübke, Wilhelm (1935), Romanisches etymologisches Wörterbuch, 3rd ed., Heidelberg: Winter, p. s.v. bos
  8. ^ Rey, Alain, ed. (1992), Dictionnaire historique de la langue française, Paris: Le Robert, p. s.v. bœuf
  9. ^ a b c 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. boi
  10. ^ Universo Cantigas: Glosario da poesía medieval profana galego-portuguesa, A Coruña: Instituto da Lingua e Literatura (ILLA), Universidade da Coruña, https://www.universocantigas.gal, p. s.v. boi
  11. ^ a b c Figueiredo, Cândido de (1899), Novo diccionário da língua portuguesa, 1st ed., 2 vols., Lisboa: Tavares Cardoso & Irmão, p. s.v. boi
  12. ^ a b Silva Bastos, José Timóteo da (1912), Diccionario etymologico, prosodico e orthographico da lingua portugueza, Lisboa: Parceria António Maria Pereira, p. s.v. boi
  13. ^ a b Dicionário Priberam da Língua Portuguesa, Lisboa: Priberam Informática, https://dicionario.priberam.org, p. s.v. boi
  14. ^ a b c d e Ferreira, Aurélio Buarque de Holanda, Novo dicionário Aurélio da língua portuguesa, digital edition, p. s.v. boi
  15. ^ a b Navarro, Fred (2004), Dicionário do Nordeste, São Paulo: Estação Liberdade, p. s.v. boi
  16. ^ a b Porto Editora (2013), Grande Dicionário da Língua Portuguesa, Porto: Porto Editora, p. 1455
  17. ^ 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. boi
  18. ^ a b Dalgado, Sebastião Rodolfo (1919–1921), Glossário luso-asiático, 2 vols., Coimbra: Imprensa da Universidade, p. 1, 132

Related etymologies

Cite this entry

“Boi.” Etymologically, 15 Nov. 2026, etymologically.com/pt/boi. Accessed 16 Nov. 2026.

Last edited on . ·