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
From the same root
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
- (astronomy, often capitalised) The moon, the natural satellite of the Earth.[4][13][1]
- The moon as seen from the Earth, in one of its phases: lua cheia, lua nova.[4][13]
- (astronomy) A natural satellite of any planet: as luas de Marte.[4][1]
- The space of a lunar month.[4][13][1]
- moonlight.[1]
- An object shaped like the moon, especially a crescent.[4][16]
- (Timor) A gold or silver disc worn at the neck by warriors.[4][13]
- (Brazil) The arched front part of a saddle.[4][16]
- (informal) The heat of animals;[13] (Brazil) menstruation.[4][13]
- (Brazil, informal, figurative) Something out of reach: pedir a lua.[4]
Word family
- luar
- enluarado
- meia-lua
- aluado
- aluar
- luarento
Related words
- 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
- ^ a b c d e f g h i j k Wiktionary, the free dictionary, https://en.wiktionary.org
- ^ 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
- ^ a b Centro de Linguística da Universidade de Lisboa, CTA – Corpus de Textos Antigos, https://teitok.clul.ul.pt/cta, p. s.v. lua
- ^ 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
- ^ a b c d Cunha, Antônio Geraldo da (2010), Dicionário etimológico da língua portuguesa, 4th ed., Rio de Janeiro: Lexikon, p. s.v. lua
- ^ Ferreira, Aurélio Buarque de Holanda, Novo dicionário Aurélio da língua portuguesa, digital edition, p. s.v. lua
- ^ García de Diego, Vicente (1985), Diccionario etimológico español e hispánico, 2nd ed., Madrid: Espasa-Calpe (1st ed. 1954), p. s.v. luna
- ^ 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
- ^ 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
- ^ 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
- ^ a b Barbosa, Agostinho (1611), Dictionarium lusitanicolatinum, Braga: Fructuoso Lourenço de Basto (CLP transcription, Universidade de Aveiro), p. s.v. lua
- ^ 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
- ^ 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
- ^ a b Dalgado, Sebastião Rodolfo (1919–1921), Glossário luso-asiático, 2 vols., Coimbra: Imprensa da Universidade, p. 1, 534
- ^ Cardoso, Jerónimo (1569–1570), Dictionarium ex lusitanico in latinum sermonem, Lisboa: João Álvares (CLP transcription, Universidade de Aveiro), p. s.v. lua
- ^ 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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