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
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
- (archaic) On the left side; esquerdo.[2][10][1]
- (archaic, figurative) ominous, ill-fated; sinistro, agourento.[2][10][1]
Noun
- A habit, tic or quirk that a person repeats without thinking; a cacoete.[2][10][1]
- destiny, fate, lot: foi o seu sestro.[2][14][1]
- A trait peculiar to someone or something.[2][10]
- A dodge to avoid work; the manha of a horse.[2][10][15]
- Bad advice.[2][10]
Word family
- sestroso
Related words
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
- ^ a b c d e f g h i j k l Wiktionary, the free dictionary, https://en.wiktionary.org
- ^ 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
- ^ 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
- ^ a b c Nascentes, Antenor (1966), Dicionário etimológico resumido, Rio de Janeiro: Instituto Nacional do Livro, p. s.v. sestro
- ^ a b Corominas, Joan; Pascual, José A. (1980–1991), Diccionario crítico etimológico castellano e hispánico, 6 vols., Madrid: Gredos, p. 5, 257
- ^ de Vaan, Michiel (2008), Etymological Dictionary of Latin and the other Italic Languages, Leiden Indo-European Etymological Dictionary Series 7, Leiden; Boston: Brill
- ^ 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
- ^ 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
- ^ 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
- ^ 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
- ^ Centro de Linguística da Universidade de Lisboa, CTA – Corpus de Textos Antigos, https://teitok.clul.ul.pt/cta, p. s.v. seestro
- ^ Houaiss, Antônio; Villar, Mauro de Salles (2001), Dicionário Houaiss da língua portuguesa, Rio de Janeiro: Objetiva, p. s.v. sestroso
- ^ Silva, António de Morais (1813), Diccionario da lingua portugueza, 2nd ed., 2 vols., Lisboa: Typographia Lacerdina, p. 2, 696
- ^ a b Ferreira, Aurélio Buarque de Holanda, Novo dicionário Aurélio da língua portuguesa, digital edition, p. s.v. sestro
- ^ 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
- ^ 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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