pathogen

Etymology

It is formed from English patho- + -gen,^[2][3][4][5] after pathogenesis and similar words;^[2] Etymonline and Barnhart call it a back-formation from pathogenic,^[6][7] which came from French pathogénique.^[6][7] The first element is from Ancient Greek πάθος (páthos, “suffering, disease”),^[8][6][7] which Etymonline traces to Proto-Indo-European *kwent(h)- (“to suffer”).^[6] The second is from -gène,^[6] from Ancient Greek -γενής (-genḗs, “born of, produced by”), related to γένος (génos, “birth, race”), and is used in the modern sense "producing".^[6][8] Merriam-Webster classes the word as International Scientific Vocabulary, with the variant pathogene.^[3][6]

Earliest recorded meaning

A microorganism that causes disease: 1880, in the Library of Universal Knowledge.^[2][6][3][7] Dictionary.com dates it to 1940–45.^[5]

Semantic evolution

The adjective pathogenic is older: Etymonline dates it to 1836, the OED to 1850 and Barnhart to 1852.^[6][2][7] The noun first named disease-producing microorganisms,^[6][2] and dictionaries now use it of any agent that causes disease, such as a bacterium or virus, though especially of microorganisms.^[3][9][4] The OED also records a figurative use.^[2]

Timeline

• 1880 – a microorganism that causes disease.^[2][6][3][7]

Meanings

Noun

1. An agent that causes disease, especially a microorganism such as a bacterium or virus.^[3][9][4][2]
2. (figurative) Something harmful that spreads like a disease.^[2]

Word family

• pathogenic
• pathogenesis
• phytopathogen
• antipathogen
• pathogeny

Related words

• pathological
• pathology
• pathosis
• pathos

References

1. ^ Wiktionary, the free dictionary, https://en.wiktionary.org
2. ^ a b c d e f g h i Oxford English Dictionary Online (accessed March 2026), Oxford: Oxford University Press
3. ^ a b c d e f Merriam-Webster Unabridged Dictionary (2024), online ed., Springfield, Mass.: Merriam-Webster
4. ^ a b c Shorter Oxford English Dictionary on Historical Principles (2002), 5th ed., ed. William R. Trumble and Angus Stevenson, Oxford: Oxford University Press
5. ^ a b Dictionary.com Unabridged (2016), based on the Random House Unabridged Dictionary, New York: Random House
6. ^ a b c d e f g h i j k Harper, Douglas. Online Etymology Dictionary, https://www.etymonline.com
7. ^ a b c d e f Barnhart, Robert K. (1988), The Barnhart Dictionary of Etymology
8. ^ a b Klein, Ernest. A Comprehensive Etymological Dictionary of the English Language. 2 vols. Amsterdam: Elsevier, 1966–1967.
9. ^ a b Collins English Dictionary (2023), Glasgow: HarperCollins