kappa

Etymology

It is borrowed from Ancient Greek κάππα (káppa),^[2][3][4][5] which is of Semitic origin,^[6][7][8][9] akin to Biblical Hebrew כַּף (kaf, “palm, hollow of the hand”), the name of the Hebrew letter kaph.^[4][6][5] Klein explains the name by the shape of the ancient Hebrew letter,^[4] and the American Heritage Dictionary gives it a Phoenician origin.^[8] Wiktionary traces it to Proto-Semitic *kapp- (“palm, hand”).^[5] Etymonline's entry instead derives it from a form of the Hebrew letter name qoph influenced by Aramaic, but its entry for K gives Phoenician kaph.^[10] The Greek letter is the source of the Roman letter K.^[10]

Earliest recorded meaning

The tenth letter of the Greek alphabet: about 1400, in Mandeville's Travels.^[2][10]

Semantic evolution

Besides the letter, the word was used in biology from 1945 for a particle found in some strains of the ciliate Paramecium aurelia, which makes them produce a substance poisonous to other strains; it is now usually regarded as a commensal bacterium.^[2][3][6] In British schoolchildren's slang, kappa has been recorded since 2001 as an insult, short for handicapped.^[11]

Timeline

• c. 1400 – the Greek letter.^[2][10]
• 1945 – in biology, a particle in some strains of paramecia.^[2]

Meanings

Noun

1. The tenth letter of the Greek alphabet (Κ, κ), transliterated as k or c.^[7][6][2]
2. (biology) A particle in the cytoplasm of certain paramecia that makes them produce a substance toxic to other strains.^[6][2][3]

Related words

• kaph
• K

References

1. ^ Wiktionary, the free dictionary, https://en.wiktionary.org
2. ^ a b c d e f g Oxford English Dictionary Online (accessed March 2026), Oxford: Oxford University Press
3. ^ a b c Shorter Oxford English Dictionary on Historical Principles (2002), 5th ed., ed. William R. Trumble and Angus Stevenson, Oxford: Oxford University Press
4. ^ a b c Klein, Ernest. A Comprehensive Etymological Dictionary of the English Language. 2 vols. Amsterdam: Elsevier, 1966–1967.
5. ^ a b c Random House Webster's Unabridged Dictionary (1999), 2nd ed., New York: Random House
6. ^ a b c d e Merriam-Webster Unabridged Dictionary (2024), online ed., Springfield, Mass.: Merriam-Webster
7. ^ a b Collins English Dictionary (2023), Glasgow: HarperCollins
8. ^ a b The American Heritage Dictionary of the English Language (online 2024), 5th ed., Boston: Houghton Mifflin Harcourt
9. ^ Gove, Philip Babcock, ed. (1961), Webster's Third New International Dictionary of the English Language, Unabridged, Springfield, Mass.: G. & C. Merriam
10. ^ a b c d Harper, Douglas. Online Etymology Dictionary, https://www.etymonline.com
11. ^ Green, Jonathon (2010), Green's Dictionary of Slang, London: Chambers; digital ed. 2016–, https://greensdictofslang.com