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Etymology and origin of the French word thermal

Confidence
Established
Formation
Derivation
First attested
1625 Duchesne More words from the 17th century
Ultimate origin
Ancient Greek θερμός
Etymology tree
inherited borrowed derived
Latin thermae
French thermal
English thermal
From the same root
English geothermal ← thermal

Pronunciation

Forms

thermal (feminine thermale, masculine plural thermaux, feminine plural thermales)[1]

Etymology

It is formed from French thermes + -al.[2][3][4] The noun is from Latin thermae (“hot baths”), from Ancient Greek θερμός (thermós, “hot”).[4]

Earliest recorded meaning

It is first found in Duchesne in 1625, applied to warm mineral waters.[2][5] The word reappears in 1735 in eaux thermales, in a translation of Woodward's work on the natural history of the earth.[2]

Semantic evolution

The adjective first described mineral waters that come out of the ground warm and have healing properties.[2][5] In the 19th century it was extended to the places where medicinal waters are used, hot or not: établissement thermal is found in 1823,[2][5] and Larousse records this sense in 1876.[6]

Timeline

  • 1625 – First recorded in Duchesne.[2][3]
  • 1735 – Eaux thermales appears in a translation from English.[2]
  • 1823 – Établissements thermaux is used of places where mineral waters are taken.[2]
  • 1832 – The derivative thermalité is recorded.[2][5]

Meanings

Adjective

  1. Of mineral water: warm where it rises and having therapeutic properties: une source thermale.[7][2]
  2. Where medicinal waters are used, spa: une ville thermale, une cure thermale.[7][6]

Word family

  • thermalité
  • thermalisme
  • géothermal

References

  1. ^ a b Wiktionary, the free dictionary, https://en.wiktionary.org
  2. ^ a b c d e f g h i j 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
  3. ^ a b Rey, Alain, ed. (2005), Le Grand Robert de la langue française, electronic version, Paris: Le Robert
  4. ^ a b Bloch, Oscar; Wartburg, Walther von (1989), Dictionnaire étymologique de la langue française, 8th ed., Paris: Presses universitaires de France
  5. ^ a b c d Rey, Alain, ed. (1992), Dictionnaire historique de la langue française, Paris: Le Robert
  6. ^ a b Guilbert, Louis; Lagane, René; Niobey, Georges, eds. (1971–1978; 1989), Grand Larousse de la langue française, Paris: Larousse
  7. ^ a b Rey-Debove, Josette; Rey, Alain, eds. (2007), Le Petit Robert de la langue française, Paris: Le Robert

Related etymologies

Cite this entry

“Thermal.” Etymologically, 14 Nov. 2026, etymologically.com/fr/thermal. Accessed 15 Nov. 2026.

Last edited on . ·