Etymologically

Etymology and origin of the French word bai

Confidence
Established
Formation
Inherited
First attested
c. 1165 More words from the 12th century
Inherited from
Latin badius via Old French
Ultimate origin
Latin badius
Etymology tree
inherited borrowed derived
Latin badius
French bai
Spanish bayo

Pronunciation

Forms

bai (feminine baie, masculine plural bais, feminine plural baies)[1]

Etymology

It is inherited from Old French bai, inherited from Latin badius (“chestnut-brown (of horses)”).[2][3][4][1] The Latin word was a technical term for the coat of a reddish-brown horse.[2] Rey notes that its only known counterpart is Celtic, in Irish buide (“yellow”), and perhaps in the Gaulish people name Badiocasses;[2] Etymonline gives the Irish word as Old Irish.[5]

Cognate with Occitan bai, Spanish bayo and Italian baio, the Italian word being probably a borrowing.[6][3] There was also a Medieval Latin form baiardus, the source of the name of Bayard, the horse of Renaud, son of Aymon.[6]

Earliest recorded meaning

It is first recorded about 1165, describing the coat of a reddish-brown horse;[2] in Raoul de Cambrai a count spurs his destrier bai.[6] The Anglo-Norman word is recorded in 1167–1168.[7]

Semantic evolution

By metonymy the adjective soon named a horse of this colour (about 1170).[2] The colour word stayed tied to horses, with many shades named in the 19th century (bai clair, bai cerise, bai châtain, bai brun).[6] Rarely and in literary use it describes things of the same colour.[8]

English took the word as bay “reddish-brown” in the mid-14th century, from Anglo-French and Old French bai.[5]

Timeline

  • c. 1165 – First recorded as the colour of a horse's coat.[2]
  • 1167–1168 – Recorded in Anglo-Norman.[7]
  • c. 1170 – Used as a noun for a horse of this colour.[2]
  • 13th century – Berte puts its heroine on a palefroy bai.[6]
  • Mid-14th century – English borrows it as bay.[5]
  • 16th century – Ambroise Paré describes the unicorn as de bay obscur.[6]

Meanings

Adjective

  1. Of a horse: having a reddish-brown coat, with the mane, tail and lower legs black; bay.[8][9][10]
  2. (rare, literary) Of a thing: of this reddish-brown colour.[8]
  3. Bolet bai: an edible bolete of this colour.[10]

Noun

  1. A bay-coloured horse.[9][11]
  2. The bay colour of a horse's coat.[9][11]

Usage notes

Names of shades are used as invariable adjectives: des chevaux bai clair, bai foncé.[6] Its homophones include baie and bey.[10][11]

References

  1. ^ a b c Wiktionary, the free dictionary, https://en.wiktionary.org
  2. ^ a b c d e f g Rey, Alain, ed. (1992), Dictionnaire historique de la langue française, Paris: Le Robert
  3. ^ a b Bloch, Oscar; Wartburg, Walther von (1989), Dictionnaire étymologique de la langue française, 8th ed., Paris: Presses universitaires de France
  4. ^ Rey, Alain, ed. (2005), Le Grand Robert de la langue française, electronic version, Paris: Le Robert
  5. ^ a b c Harper, Douglas. Online Etymology Dictionary, https://www.etymonline.com
  6. ^ a b c d e f g Littré, Émile (1873–1877), Dictionnaire de la langue française, 4 vols. and supplement, Paris: Hachette
  7. ^ a b Anglo-Norman Dictionary (AND2), Aberystwyth University, anglo-norman.net (2nd ed., 2005–)
  8. ^ a b c Trésor de la langue française informatisé (2004), ATILF – CNRS & Université de Lorraine, atilf.fr/tlfi; electronic version of Imbs, Paul; Quemada, Bernard, eds. (1971–1994), Trésor de la langue française, Paris: CNRS / Gallimard
  9. ^ a b c Guilbert, Louis; Lagane, René; Niobey, Georges, eds. (1971–1978; 1989), Grand Larousse de la langue française, Paris: Larousse
  10. ^ a b c Rey-Debove, Josette; Rey, Alain, eds. (2007), Le Petit Robert de la langue française, Paris: Le Robert
  11. ^ a b c Dictionnaire de français Larousse, larousse.fr/dictionnaires/francais (accessed 2024)

Related etymologies

Cite this entry

“Bai.” Etymologically, 14 Nov. 2026, etymologically.com/fr/bai. Accessed 15 Nov. 2026.

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