Etymologically

Etymology and origin of the Portuguese word irmão

Confidence
Established
Formation
Inherited
First attested
1259 a Galician-Portuguese document, spelt irmaao More words from the 13th century
Inherited from
Latin germanus
Ultimate origin
Latin germen
Etymology tree
inherited borrowed derived
Latin germen
Italian germe
Latin germānus
Portuguese irmão
Spanish hermano
French germain
From the same root
English germ ← germen
Latin germinō ← germen
English germane ← germānus

Pronunciation

  • Brazil: /iʁˈmɐ̃w̃/, [iɦˈmɐ̃ʊ̯̃][1]
  • São-Paulo: /iɾˈmɐ̃w̃/, [iɾˈmɐ̃ʊ̯̃][1]
  • Rio-de-Janeiro: /iʁˈmɐ̃w̃/, [iʁˈmɐ̃ʊ̯̃][1]
  • Caipira: /iɻˈmɐ̃w̃/, [iɻˈmɐ̃ʊ̯̃][1]

Forms

irmão m (plural irmãos, feminine irmã, feminine plural irmãs)[1] 13th-century documents write irmaao, yrmão, hirmaa (feminine) and ermano.[2][3][4]

Etymology

It is inherited from Latin germānus (“brother”), short for frāter germānus “brother of the same parents”, in which the adjective meant “of the same stock, true”.[4][1][5] The adjective is derived from germen (“sprout; offspring”).[4][1] The 13th-century texts have Old Galician-Portuguese irmão and Old Galician-Portuguese ermano.[4][3]

The loss of the initial /ʒ/ is explained by Houaiss and Nascentes as a result of phrase phonetics: the noun was almost always preceded by a possessive, as in meu germano, so its first consonant stood between vowels and fell as such consonants did, giving *ermão and then the modern form.[4][5] Houaiss also explains why the Latin frāter was not continued for “brother”: its descendant frade specialised in the religious sense.[4]

The same Latin word is Galician irmán, Spanish hermano, Catalan germà and Mirandese armano.[1][6] Spanish has it from a document of 938, spelt Old Spanish iermano.[7][8] Portuguese also has the learned doublet germano and the Spanish loan hermano.[1]

The Latin noun goes back to *ǵénh₁mn̥ (“offspring, seed”), from *ǵenh₁- (“to beget”).[1] Houaiss derives it from an earlier *genmen by dissimilation.[4]

Earliest recorded meaning

Galician-Portuguese documents have Garcia Meendez clerigo sou irmaao in 1259, et meu yrmão in 1269 and eu un cũ meus yrmaos “I, one of my brothers” in 1269;[2] sua hirmaa “his sister” appears in 1260.[2] In the Cantigas de Santa Maria the word is also used of fellow Christians: crischão te faz e irmão nosso “makes you a Christian and our brother”.[2]

Semantic evolution

Besides the family sense, the medieval language already used irmão for a fellow believer.[2] Cunha's definition adds the member of a confraternity.[3] Barbosa (1611) distinguishes the irmão inteyro de pay, e may “full brother”, and Cardoso (1569) gives Latin frater.[9][10] Later senses are a lay brother in a religious order, a member of the Freemasons, a title used between Christian sovereigns or by the pope to bishops, and, informally, a form of address.[4][11] As an adjective it means “similar, matching”, of people or things.[4]

Timeline

  • 1259 – irmaao in a Galician-Portuguese document.[2]
  • 1260 – the feminine hirmaa.[2]
  • 13th century – irmão in the Cantigas de Santa Maria; the derivative coirmaão.[2][3]
  • 14th century – first record of irmandade, spelt yrmandade.[3]
  • 1496 – first occurrence in the CTA corpus, in the História de mui nobre Vespasiano.[12]
  • 1611 – Barbosa defines irmão inteyro de pay, e may.[9]
  • 17th century – first records of irmanar and desirmanar.[3]

Meanings

Noun

  1. A brother: a son of the same parents, or of the same father or mother only, in relation to their other children; in the plural, siblings.[4][11][1]
  2. A person one is bound to by a common purpose or by fellow feeling; a close friend.[4][1]
  3. A fellow member of a party or doctrine, correligionário.[4][11]
  4. A member of a confraria or irmandade; a freemason.[4][11]
  5. (religion) A lay brother who has taken vows but not holy orders; a friar without higher office.[4][11]
  6. (informal) A form of address: Tudo bem, irmão?[4][1]

Adjective

  1. Similar in form, origin or nature to another person, animal or thing: kindred souls.[4]

Word family

  • coirmão
  • irmanar
  • desirmanar
  • irmanação
  • irmandade
  • irmãozinho

Usage notes

Set phrases include irmão de leite or irmão colaço, a child nursed by the same wet nurse, irmão de armas, a comrade in arms, and irmão uterino and irmão consanguíneo for half-brothers on the mother's or the father's side.[4]

References

  1. ^ a b c d e f g h i j k l m Wiktionary, the free dictionary, https://en.wiktionary.org
  2. ^ 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. irmão
  3. ^ a b c d e f Cunha, Antônio Geraldo da (2010), Dicionário etimológico da língua portuguesa, 4th ed., Rio de Janeiro: Lexikon, p. s.v. irmão
  4. ^ 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. irmão
  5. ^ a b Nascentes, Antenor (1966), Dicionário etimológico resumido, Rio de Janeiro: Instituto Nacional do Livro, p. s.v. irmão
  6. ^ García de Diego, Vicente (1985), Diccionario etimológico español e hispánico, 2nd ed., Madrid: Espasa-Calpe (1st ed. 1954), p. s.v. germanus
  7. ^ Corominas, Joan; Pascual, José A. (1980–1991), Diccionario crítico etimológico castellano e hispánico, 6 vols., Madrid: Gredos, p. 3, 347
  8. ^ Corominas, Joan (1973), Breve diccionario etimológico de la lengua castellana, 3rd ed., Madrid: Gredos, p. s.v. hermano
  9. ^ a b Barbosa, Agostinho (1611), Dictionarium lusitanicolatinum, Braga: Fructuoso Lourenço de Basto (CLP transcription, Universidade de Aveiro), p. s.v. irmão
  10. ^ Cardoso, Jerónimo (1569–1570), Dictionarium ex lusitanico in latinum sermonem, Lisboa: João Álvares (CLP transcription, Universidade de Aveiro), p. s.v. irmão
  11. ^ a b c d e Ferreira, Aurélio Buarque de Holanda, Novo dicionário Aurélio da língua portuguesa, digital edition, p. s.v. irmão
  12. ^ Centro de Linguística da Universidade de Lisboa, CTA – Corpus de Textos Antigos, https://teitok.clul.ul.pt/cta, p. s.v. irmão

Related etymologies

Cite this entry

“Irmão.” Etymologically, 15 Nov. 2026, etymologically.com/pt/irm%C3%A3o. Accessed 16 Nov. 2026.

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