erosion

Etymology

It is borrowed from Middle French erosion,^[2][3][4][5] from Latin ērōsiō (“a gnawing away”),^[4][5][6] a noun of action from ērōsus (“eaten away, gnawed away”),^[6][5] the past participle of ērōdō (“to gnaw away, consume”).^[2][4][7] The Latin verb is formed from ex- (“out, away”) and rōdō (“to gnaw”),^[4][5] the verb that also gave rodent;^[4][6] Etymonline calls the origin of the simple verb uncertain, possibly an extended form of Proto-Indo-European *red- (“to scrape, scratch, gnaw”).^[4] The English verb erode came later, in the 1610s, either as a back-formation from erosion or from French éroder.^[4][5]

Earliest recorded meaning

The action or process of eating or wearing away: about 1541, in Robert Copland's translation of a surgical questionary by Guy de Chauliac,^[3][2] so the word first belonged to medicine.^[3][8] Etymonline dates it to the 1540s.^[4]

Semantic evolution

Until the 18th century the word was used chiefly of acids, ulcers and the like eating into bodily tissue: Johnson (1755) defined it as the act of eating away and the state of being eaten away, a canker or corrosion, with a medical quotation on sea salt.^[9][4] An instance of erosion could be called an erosion from 1710.^[3][10] The Historical Thesaurus places the geological use, the wearing away of land and rock, from 1774,^[8] and Etymonline dates the geological sense of the verb erode to 1830.^[4] A transferred and figurative use, the gradual loss or weakening of something abstract, followed in 1804,^[3][8] and the attributive use in geology (erosion cycle, erosion theory) in 1879.^[3] The derivative erosional dates from the early 20th century.^[10]

Timeline

• c. 1541 – the action of eating or wearing away, in a surgical text.^[3][2]
• 1710 – an instance of erosion.^[3]
• 1755 – Johnson defines it as the act of eating away and the state of being eaten away.^[9]
• 1774 – the wearing away of land by natural agents (geology).^[8]
• 1804 – figurative and transferred uses.^[3][8]
• 1879 – attributive use in geology: erosion cycle, erosion theory.^[3]

Meanings

Noun

1. The group of natural processes, such as weathering, abrasion, solution and transport by water, ice and wind, by which rock and soil are worn away from the earth's surface: Without trees on the slope, erosion took the topsoil within a few years.^[6][2][11]
2. (medicine) The gradual destruction of surface tissue, as of a mucous membrane, by friction, inflammation, ulceration or injury.^[6][2][12]
3. (dentistry) The progressive loss of the hard substance of a tooth.^[2]
4. The process of eroding or the state of being eroded; figuratively, a gradual weakening or decline: the erosion of trust in the council.^[6][11][3]
5. An instance or result of erosion.^[3][10][12]

Word family

• erosional
• erosionally
• antierosion
• erosive
• sheet erosion
• splash erosion

Related words

• erode
• rodent
• corrosion
• erose

References

1. ^ a b Wiktionary, the free dictionary, https://en.wiktionary.org
2. ^ a b c d e f g Merriam-Webster Unabridged Dictionary (2024), online ed., Springfield, Mass.: Merriam-Webster
3. ^ a b c d e f g h i j k l Oxford English Dictionary Online (accessed March 2026), Oxford: Oxford University Press
4. ^ a b c d e f g h i j Harper, Douglas. Online Etymology Dictionary, https://www.etymonline.com
5. ^ a b c d e Klein, Ernest. A Comprehensive Etymological Dictionary of the English Language. 2 vols. Amsterdam: Elsevier, 1966–1967.
6. ^ a b c d e f The American Heritage Dictionary of the English Language (online 2024), 5th ed., Boston: Houghton Mifflin Harcourt
7. ^ Stevenson, Angus, ed. (2010), Oxford Dictionary of English, 3rd ed., Oxford: Oxford University Press
8. ^ a b c d e Kay, Christian; Roberts, Jane; Samuels, Michael; Wotherspoon, Irené, eds. (2009), Historical Thesaurus of the Oxford English Dictionary, Oxford: Oxford University Press; online edition (2024)
9. ^ a b Johnson, Samuel (1755), A Dictionary of the English Language, London; 4th ed. 1773; Johnson's Dictionary Online, ed. Beth Rapp Young et al.
10. ^ a b c Shorter Oxford English Dictionary on Historical Principles (2002), 5th ed., ed. William R. Trumble and Angus Stevenson, Oxford: Oxford University Press
11. ^ a b Collins English Dictionary (2023), Glasgow: HarperCollins
12. ^ a b Soanes, Catherine; Stevenson, Angus, eds. (2004), Concise Oxford English Dictionary, 11th ed., Oxford: Oxford University Press