Etymologically

Etymology and origin of the Portuguese word lua

Confidence
Established
Formation
Inherited
First attested
1200s spelt llua and luha More words from the 13th century
Inherited from
Latin luna
Ultimate origin
Proto-Indo-European *lewk-
Etymology tree
inherited borrowed derived
Latin lūna
Catalan lluna
French lune
Italian luna
Portuguese lua
Romanian lună
Spanish luna
From the same root
English lunatic ← lūna
Latin lūnāris ← lūna
Latin lūnāticus ← lūna
Latin lunatus ← lūna
Latin plēnilūnium ← lūna
French lunette ← lune

Pronunciation

  • Brazil: /ˈlu.ɐ/[1]
  • Portugal: /ˈlu.ɐ/[1]

Forms

lua f (plural luas)[1] Houaiss records llua and luha in the 13th century, lua in the 14th and luua in the 15th;[2][3] Cunha has lũa from the 13th century.[4][5] The Horto do Esposo, copied 1390–1437, writes both lũa and lua.[2][3]

Etymology

It is inherited from Latin lūna (“moon”), written Old Galician-Portuguese lũa in the oldest texts.[4][5][1] Houaiss and Aurélio call it the popular outcome of the Latin word.[4][6]

The same Latin word is Galician lúa, Spanish luna, Catalan lluna, Occitan luna, French lune, Italian luna and Romanian lună.[7][1] The Latin word, Old Latin losna at Praeneste, goes back to Proto-Italic *louksnā.[8][1] De Vaan reconstructs a PIE adjective meaning “shiny, bright”, probably used as an epithet of the moon, from the root of lūx (“light”); its cognates include Ancient Greek λύχνος (lúkhnos, “lamp”) and Avestan raoxšna- (“light”).[8] Wiktionary gives the PIE form as Proto-Indo-European *lówksneh₂, from *lewk- (“to shine”).[1] Vieira (1871) still derived it from Lucina, a name of Juno or Diana.[9]

Earliest recorded meaning

The word is recorded from the 13th century.[4][5] A cantiga has a man who vio [e]na lũa “saw in the moon” the omen of a rich church.[10] The sense is the moon itself.[10]

Semantic evolution

Barbosa (1611) lists lua nova, lua chea, lua crecente and lua minguante for the phases.[11] Morais (1789) records figurative phrases: ladrar à lua, said of someone railing at a person he cannot harm, ter a lua sobre o forno “to be moonstruck”, and homem de luas, a man of changeable temper.[12]

The word also came to mean the space of a lunar month, the satellite of any planet, and things shaped like the moon, such as the Turkish crescent.[4][13] In Timor the luas are gold or silver discs that warriors wear at the neck as a sign that they have cut off enemies' heads;[14] Dalgado quotes Afonso de Castro on them, and Houaiss dates the sense to 1867.[14][4] Brazilian usage adds the front of a saddle, the heat of animals and menstruation, and the moon as anything out of reach.[4]

Timeline

  • 13th century – first records, spelt llua, luha and lũa.[4][5]
  • 14th century – the spelling lua.[4]
  • c. 1430 – the Horto do Esposo writes lũa and lua.[2]
  • 1569 – Cardoso renders it by Latin luna.[15]
  • 1611 – Barbosa lists the phases lua nova and lua chea.[11]
  • 1789 – Morais records ladrar à lua and homem de luas.[12]
  • 1867 – Houaiss's date for the Timorese lua, a metal disc.[4]

Meanings

Noun

  1. (astronomy, often capitalised) The moon, the natural satellite of the Earth.[4][13][1]
  2. The moon as seen from the Earth, in one of its phases: lua cheia, lua nova.[4][13]
  3. (astronomy) A natural satellite of any planet: as luas de Marte.[4][1]
  4. The space of a lunar month.[4][13][1]
  5. moonlight.[1]
  6. An object shaped like the moon, especially a crescent.[4][16]
  7. (Timor) A gold or silver disc worn at the neck by warriors.[4][13]
  8. (Brazil) The arched front part of a saddle.[4][16]
  9. (informal) The heat of animals;[13] (Brazil) menstruation.[4][13]
  10. (Brazil, informal, figurative) Something out of reach: pedir a lua.[4]

Word family

  • luar
  • enluarado
  • meia-lua
  • aluado
  • aluar
  • luarento
  • aluamento
  • alunagem
  • alunar
  • alunissagem
  • alunissar
  • alunizar
  • lunar
  • lunático
  • luneta
  • lunação
  • lúnula
  • sublunar
  • Latin lūna
  • Galician lúa
  • Spanish luna

Usage notes

Estar na lua or andar na lua means to be absent-minded, and estar com a lua to talk nonsense.[13] Priberam notes that the name of the Earth's satellite is written with a capital, Lua.[13]

References

  1. ^ a b c d e f g h i j k Wiktionary, the free dictionary, https://en.wiktionary.org
  2. ^ a b c Centro de Linguística da Universidade de Lisboa, CTA – Corpus de Textos Antigos, https://teitok.clul.ul.pt/cta, p. s.v. lũa
  3. ^ a b Centro de Linguística da Universidade de Lisboa, CTA – Corpus de Textos Antigos, https://teitok.clul.ul.pt/cta, p. s.v. lua
  4. ^ a b c d e f g h i j k l m n o p q r s Houaiss, Antônio; Villar, Mauro de Salles (2001), Dicionário Houaiss da língua portuguesa, Rio de Janeiro: Objetiva, p. s.v. lua
  5. ^ a b c d Cunha, Antônio Geraldo da (2010), Dicionário etimológico da língua portuguesa, 4th ed., Rio de Janeiro: Lexikon, p. s.v. lua
  6. ^ Ferreira, Aurélio Buarque de Holanda, Novo dicionário Aurélio da língua portuguesa, digital edition, p. s.v. lua
  7. ^ García de Diego, Vicente (1985), Diccionario etimológico español e hispánico, 2nd ed., Madrid: Espasa-Calpe (1st ed. 1954), p. s.v. luna
  8. ^ a b de Vaan, Michiel (2008), Etymological Dictionary of Latin and the other Italic Languages, Leiden Indo-European Etymological Dictionary Series 7, Leiden; Boston: Brill
  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. 3, 1344
  10. ^ a b 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. lũa
  11. ^ a b Barbosa, Agostinho (1611), Dictionarium lusitanicolatinum, Braga: Fructuoso Lourenço de Basto (CLP transcription, Universidade de Aveiro), p. s.v. lua
  12. ^ 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. 2, 34
  13. ^ a b c d e f g h i Dicionário Priberam da Língua Portuguesa, Lisboa: Priberam Informática, https://dicionario.priberam.org, p. s.v. lua
  14. ^ a b Dalgado, Sebastião Rodolfo (1919–1921), Glossário luso-asiático, 2 vols., Coimbra: Imprensa da Universidade, p. 1, 534
  15. ^ Cardoso, Jerónimo (1569–1570), Dictionarium ex lusitanico in latinum sermonem, Lisboa: João Álvares (CLP transcription, Universidade de Aveiro), p. s.v. lua
  16. ^ a b 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. lua

Related etymologies

Cite this entry

“Lua.” Etymologically, 15 Nov. 2026, etymologically.com/pt/lua. Accessed 16 Nov. 2026.

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