Etymologically

Etymology and origin of the French word crasse

Confidence
Established
Formation
Inherited
First attested
1176–1187 Cantique des Cantiques More words from the 12th century
Inherited from
Latin crassus via Old French
Ultimate origin
Latin crassus
Etymology tree
inherited borrowed derived
Latin crassus
French crasse
English crass
From the same root
Latin crassitūdō ← crassus

Pronunciation

Forms

crasse f (feminine only, feminine plural crasses)[1] The masculine of the Old French adjective was cras, which lasted until the 17th century.[2][3]

Etymology

It is inherited from Old French crasse, the feminine form of the Old French adjective cras, inherited from Latin crassus (“thick, fat, coarse”).[4][5][1] The noun is the adjective used as a substantive.[4][2] Bloch and Wartburg instead treat the word as borrowed from the feminine of the Latin adjective.[6] Rey describes the Latin word as expressive in origin, the opposite of liquidus, tenuis and macer.[2]

It is a doublet of gras, from the same Latin adjective.[1][3]

Earliest recorded meaning

The adjective is first recorded in 1176–1187 in a version of the Song of Songs, meaning “plump, well fed”.[4] The noun is dated about 1327 by Bloch and Wartburg; the TLFi's first quotation, from a 15th-century medical text of Namur, has le crasse de sons “the coarsest part of the bran”.[4][6]

Semantic evolution

As an adjective, cras, crasse “thick, dense, fat” lasted until the 17th century, mostly in the feminine and especially in medicine, where humeurs crasses were thick bodily humours.[2][4] From the 13th century it also meant “base, filthy”.[4] Today it survives mainly in ignorance crasse, recorded from the 14th century according to Bloch and Wartburg and in Du Bellay in 1549, a calque of Saint Jerome's crassa rusticitas.[4][6][2]

The noun first meant the coarsest part of something and was narrowed to a layer of dirt.[2] Its figurative senses, “lack of refinement” (Cotgrave, 1611) and “sordid avarice” (Boileau, 1666), have gone out of use.[4][2] With an article, une crasse is technically the dross of a molten metal (1611).[4][2] The familiar faire des crasses à quelqu'un “to play dirty tricks on someone” is found in a letter of Flaubert of 1853;[4][7] the Petit Robert dates it to 1843, with a sense “lack of politeness” from 1826.[8]

The English adjective crass was taken from French in the 1540s.[9]

Timeline

  • 1176–1187 – The adjective crasse “plump, well fed” is recorded.[4]
  • 13th century – Hystore Job uses it for “base, filthy”.[4][10]
  • c. 1327 – The noun is recorded, according to Bloch and Wartburg.[6]
  • 15th century – Le crasse de sons “the coarsest part of the bran” in a Namur medical text.[4]
  • 1540s – English borrows the adjective as crass.[9]
  • 1546 – Charles Estienne writes of the crasse (thick) membrane of the brain.[4]
  • 1549 – Du Bellay writes ignorance crasse.[4]
  • 1611 – Cotgrave records the senses “dross of metal” and “boorishness”.[4]
  • 1666 – Boileau uses it for “sordid avarice”.[4]
  • 1853 – Flaubert writes faire des crasses “to play dirty tricks”.[4]

Meanings

Adjective

  1. (feminine only; history of medicine) Thick and viscous: humeur crasse.[8][4]
  2. (figurative) Gross, inexcusable, crass, chiefly in ignorance crasse.[8][4]
  3. (of humour) Dirty, filthy.[1]

Noun

  1. A layer of dirt that forms on the skin, on linen or on objects: ses mains étaient noires de crasse.[8][4]
  2. (technical) dross or slag of a molten metal.[8][4]
  3. (familiar) A dirty trick: faire une crasse à quelqu'un.[8][1]

Word family

  • crasser
  • crasseux
  • crassier
  • décrasser
  • encrasser

References

  1. ^ a b c d e f Wiktionary, the free dictionary, https://en.wiktionary.org
  2. ^ a b c d e f g h Rey, Alain, ed. (1992), Dictionnaire historique de la langue française, Paris: Le Robert
  3. ^ a b Littré, Émile (1873–1877), Dictionnaire de la langue française, 4 vols. and supplement, Paris: Hachette
  4. ^ a b c d e f g h i j k l m n o p q r s t u v 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
  5. ^ Wartburg, Walther von, et al. (1922–2002), Französisches Etymologisches Wörterbuch, 25 vols., Bonn / Leipzig / Basel: Klopp / Teubner / Zbinden, p. 2, 1280a
  6. ^ a b c d Bloch, Oscar; Wartburg, Walther von (1989), Dictionnaire étymologique de la langue française, 8th ed., Paris: Presses universitaires de France
  7. ^ Quemada, Bernard, ed. (1959–2006), Datations et documents lexicographiques (Base historique du vocabulaire français, BHVF), Paris: Klincksieck / CNRS / Champion; ATILF
  8. ^ a b c d e f Rey-Debove, Josette; Rey, Alain, eds. (2007), Le Petit Robert de la langue française, Paris: Le Robert
  9. ^ a b Harper, Douglas. Online Etymology Dictionary, https://www.etymonline.com
  10. ^ Guilbert, Louis; Lagane, René; Niobey, Georges, eds. (1971–1978; 1989), Grand Larousse de la langue française, Paris: Larousse

Related etymologies

Cite this entry

“Crasse.” Etymologically, 14 Nov. 2026, etymologically.com/fr/crasse. Accessed 15 Nov. 2026.

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