Etymologically

Etymology and origin of the Portuguese word sestro

Confidence
Established
Formation
Inherited
First attested
1267 a charter, spelt sẽestra More words from the 13th century
Inherited from
Latin sinister
Ultimate origin
Latin sinister
Etymology tree
inherited borrowed derived
Latin sinister
French senestre
Portuguese sestro
Italian sinistro
From the same root
English sinister ← sinister
Italian sinistra ← sinister
Latin sinistre ← sinister

Pronunciation

  • Brazil: /ˈsɛs.tɾu/[1]
  • Rio-de-Janeiro: /ˈsɛʃ.tɾu/[1]
  • Portugal: /ˈsɛʃ.tɾu/[1]

Forms

sestro (feminine sestra, masculine plural sestros, feminine plural sestras, not comparable)[1] Old Galician-Portuguese wrote seestro, sẽestro and siestro;[2][3] sestros is recorded in the 15th century, and seextro and soestro in the 18th.[2][3]

Etymology

It is inherited from Latin sinister (“left”), written Old Galician-Portuguese seestro in the oldest texts.[2][4][1] Lorenzo and Wiktionary trace it to a Vulgar Latin form sinextrum, which took its ⟨x⟩ from dexter (“right”).[3][1] Corominas explains the Spanish word in the same way.[5] It is a doublet of the learned sinistro.[2][1]

The same Latin word is Spanish siniestro.[5][1] De Vaan tentatively derives the Latin word from Proto-Indo-European *senh₂-is- (“more obtaining”).[6]

Earliest recorded meaning

A charter of 1267 has de mão sẽestra “on the left hand”.[3] In the 13th-century cantigas seestro means “left”, and also “ill-omened”: Johan Airas writes of men who look for a crow on the left when they set out, queren corvo seestro.[3]

Semantic evolution

The pairing of left and right runs through the medieval texts, as in a destro et a seestro “to the right and to the left”.[3] Nascentes quotes the Leal Conselheiro: Nom saiba a tua seestra o que faz a tua deestra “let your left hand not know what your right hand does”.[7]

As an adjective the word became archaic, and it lived on as a noun.[4] Houaiss dates the noun's sense “habit, tic, quirk” to 1562–1575, and Morais quotes Paiva for it: de todos os sestros, que hũ Príncipe toma se faz honra.[2][8] Nascentes explains the shift by the old view that left-handedness was against nature.[4] The noun also took the senses “destiny, fate”, “a trait proper to someone” and “a dodge to avoid work”, and the old dictionaries add the vices of a horse and “bad advice”.[2][9][10]

Timeline

  • 1267 – de mão sẽestra in a charter.[3]
  • 1200s – seestro “left; ill-omened” in the cantigas.[2][3]
  • c. 1430 – the Horto do Esposo has seestro.[11]
  • 1400s – the contracted form sestros.[2]
  • 1562 – first date of the sense “habit, tic”, between 1562 and 1575.[2]
  • 1720 – first record of sestroso.[12]
  • 1813 – Morais records the adjective in the senses “left” and “sinister”.[13]

Meanings

Adjective

  1. (archaic) On the left side; esquerdo.[2][10][1]
  2. (archaic, figurative) ominous, ill-fated; sinistro, agourento.[2][10][1]

Noun

  1. A habit, tic or quirk that a person repeats without thinking; a cacoete.[2][10][1]
  2. destiny, fate, lot: foi o seu sestro.[2][14][1]
  3. A trait peculiar to someone or something.[2][10]
  4. A dodge to avoid work; the manha of a horse.[2][10][15]
  5. Bad advice.[2][10]

Word family

  • sestroso

Usage notes

A separate noun sestro, with closed /e/, is a variant of sistro “sistrum”, first recorded in 1553.[2][14] Bluteau describes it as a brass instrument like a tambourine played at the folk dances of Lisbon.[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 q Houaiss, Antônio; Villar, Mauro de Salles (2001), Dicionário Houaiss da língua portuguesa, Rio de Janeiro: Objetiva, p. s.v. sestro
  3. ^ a b c d e f g h 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. seestro
  4. ^ a b c Nascentes, Antenor (1966), Dicionário etimológico resumido, Rio de Janeiro: Instituto Nacional do Livro, p. s.v. sestro
  5. ^ a b Corominas, Joan; Pascual, José A. (1980–1991), Diccionario crítico etimológico castellano e hispánico, 6 vols., Madrid: Gredos, p. 5, 257
  6. ^ de Vaan, Michiel (2008), Etymological Dictionary of Latin and the other Italic Languages, Leiden Indo-European Etymological Dictionary Series 7, Leiden; Boston: Brill
  7. ^ 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. sestro
  8. ^ 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, 398
  9. ^ Vieira, Frei Domingos (1871–1874), Grande Diccionario Portuguez ou Thesouro da lingua portugueza, 5 vols., Porto: Ernesto Chardron e Bartholomeu H. de Moraes, p. 5, 514
  10. ^ a b c d e f g 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. sestro
  11. ^ Centro de Linguística da Universidade de Lisboa, CTA – Corpus de Textos Antigos, https://teitok.clul.ul.pt/cta, p. s.v. seestro
  12. ^ Houaiss, Antônio; Villar, Mauro de Salles (2001), Dicionário Houaiss da língua portuguesa, Rio de Janeiro: Objetiva, p. s.v. sestroso
  13. ^ Silva, António de Morais (1813), Diccionario da lingua portugueza, 2nd ed., 2 vols., Lisboa: Typographia Lacerdina, p. 2, 696
  14. ^ a b Ferreira, Aurélio Buarque de Holanda, Novo dicionário Aurélio da língua portuguesa, digital edition, p. s.v. sestro
  15. ^ 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. sestro
  16. ^ Bluteau, Raphael (1712–1728), Vocabulario portuguez e latino, 8 vols. + 2 supplement vols., Coimbra / Lisboa (CLP transcription, Universidade de Aveiro), p. s.v. sestro

Related etymologies

Cite this entry

“Sestro.” Etymologically, 15 Nov. 2026, etymologically.com/pt/sestro. Accessed 16 Nov. 2026.

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