rayo

Forms

rayo m (plural rayos)^[1] Old Spanish also wrote rrayo.^[2][3] Asturian has raxo and Andalusian rajo “ray or flash of light”.^[4]

Etymology

It is inherited from Latin radius (“rod; spoke of a wheel; ray of light”).^[5][6][7][1] The learned doublet radio is recorded from the early 18th century.^[5][6][1] De Vaan thinks a link with rādīx (“root”) unlikely because the meaning is quite different, and finds no clear candidate for the root.^[8]

The same Latin word is Portuguese raio, Galician raio, Catalan raig, Occitan rai, French rai, Italian raggio and Romanian rază.^[4][9][1] The sense “lightning bolt” is an innovation of Castilian and Portuguese, not shared by the other Romance languages except Vegliote, where the word means “lightning flash”;^[5][6] Sardinian rayu in Sassari may be a Castilianism.^[5][6] Corominas thinks the simplest explanation is a comparison of the spark with a sudden ray of light, and notes that Virgil and Valerius Flaccus already use the Latin word close to that sense.^[5][6]

Earliest recorded meaning

Berceo, the first record (1220–1250), uses it for a ray of light;^[5][6] Berceo, Juan Ruiz and the Libro de Apolonio also use it for a lightning bolt.^[5][6] The earliest CDH hit, in the Semejanza del mundo (c. 1223), is in that sense: Se fazen los rrelanpagos e los rrayos “the flashes and the thunderbolts are made”.^[3]

Semantic evolution

The sense “spoke of a wheel” is in Nebrija.^[5] Alfonso X's prose uses rayos de fuego for the rays shining from a stone.^[10] Covarrubias put the lightning bolt first, explained the name by the likeness to the sun's rays breaking through a cloud, and recorded un rayo del cielo for a sudden disaster, the spokes of a wheel and rayos de dolor “shooting pains”.^[11] The Diccionario de Autoridades defined it first as the straight line along which something travels, a technical sense, then the ray of light and the spoke.^[12]

The Academy's 1884 edition described lightning as electric fire breaking from a cloud and added figurative senses.^[13] The DLE gives the rays of any form of energy, the ray of light, lightning, the spoke, and figurative senses: something very forceful, a quick-witted or quick-moving person, a sudden sharp pain, and a sudden misfortune.^[7]

Timeline

• 1220–1250 – Berceo uses rayo for a ray of light and for lightning.^[5][6]
• c. 1223 – rrayos “thunderbolts” in the Semejanza del mundo.^[3]
• 1250–1279 – rayos de fuego in Alfonso X's prose.^[10]
• c. 1495 – the sense “spoke of a wheel” in Nebrija.^[5]
• 1611 – Covarrubias records un rayo del cielo and rayos de dolor.^[11]
• early 18th century – the learned doublet radio.^[5][6]
• 1884 – the Academy's dictionary first gives the etymology, from Latin radius.^[13]

Meanings

Noun

1. (physics) A ray: each of the lines along which a form of energy spreads from its source.^[7][1]
2. A ray or beam of light, especially from the sun: Un rayo de sol entraba por la persiana.^[7][1]
3. A bolt of lightning: El rayo cayó sobre el campanario.^[7][1]
4. A spoke of a wheel.^[7]
5. Something of great force or effect.^[7]
6. A person of very quick wit.^[7]
7. A person quick and nimble in action.^[7]
8. A sharp, momentary pain.^[7][11]
9. A sudden, unforeseen misfortune or punishment.^[7][11]

Word family

• enrayar
• pararrayos

Related words

• raya
• rayar
• radio
• radiar
• irradiar
• radiante
• Latin radius

Usage notes

Rayo is also a personal form of the verbs rayar and raer; those are separate words.^[1]

References

1. ^ a b c d e f g h i Wiktionary, the free dictionary, https://en.wiktionary.org
2. ^ Diccionario del Español Medieval electrónico (DEMel), data publication 2026 (CC BY-SA), Universität Rostock, p. s.v. rayo
3. ^ a b c Real Academia Española (2013–), Corpus del Diccionario histórico de la lengua española (CDH), version 3.1, https://apps.rae.es/CNDHE, p. s.v. rayo
4. ^ a b García de Diego, Vicente (1985), Diccionario etimológico español e hispánico, 2nd ed., Madrid: Espasa-Calpe (1st ed. 1954), p. s.v. radius
5. ^ a b c d e f g h i j k Corominas, Joan; Pascual, José A. (1980–1991), Diccionario crítico etimológico castellano e hispánico, 6 vols., Madrid: Gredos, p. 4, 799
6. ^ a b c d e f g h i Corominas, Joan (1973), Breve diccionario etimológico de la lengua castellana, 3rd ed., Madrid: Gredos, p. s.v. rayo
7. ^ a b c d e f g h i j k Real Academia Española; Asociación de Academias de la Lengua Española (2014–), Diccionario de la lengua española, 23rd ed., online version 23.8, https://dle.rae.es, p. s.v. rayo
8. ^ de Vaan, Michiel (2008), Etymological Dictionary of Latin and the other Italic Languages, Leiden Indo-European Etymological Dictionary Series 7, Leiden; Boston: Brill
9. ^ Meyer-Lübke, Wilhelm (1935), Romanisches etymologisches Wörterbuch, 3rd ed., Heidelberg: Winter, p. s.v. radius
10. ^ a b Kasten, Lloyd A.; Nitti, John J.; Gago Jover, Francisco (2002–), Diccionario de la prosa castellana del Rey Alfonso X, New York: Hispanic Seminary of Medieval Studies (electronic edition 2024), p. s.v. rayo
11. ^ a b c d Covarrubias Orozco, Sebastián de (1611), Tesoro de la lengua castellana o española, Madrid: Luis Sánchez (Biblioteca Wordkers transcription, CC BY 4.0), p. 1244
12. ^ Real Academia Española (1726–1739), Diccionario de la lengua castellana (Diccionario de Autoridades), 6 vols., Madrid: Francisco del Hierro, p. s.v. rayo
13. ^ a b Real Academia Española (1884), Diccionario de la lengua castellana, 12th ed., Madrid: Imprenta de D. Gregorio Hernando (the first Academy edition with etymologies), p. 899