Etymologically
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diagnostic

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Pronunciation

  • UK: /daɪ.əɡˈnɒs.tɪk/[1]
  • US: /ˌdaɪ.əɡˈnɑ.stɪk/, /ˌdaɪ.əɡˈnɒs.tɪk/[1]

Etymology

It is borrowed from Ancient Greek διαγνωστικός (diagnōstikós, “able to distinguish”),[2][3][4] from διαγνωστός (diagnōstós, “distinguishable”), the verbal adjective of διαγιγνώσκω (diagignṓskō, “to distinguish, discern”),[2][5][6] from διά (diá, “apart, between”) and γιγνώσκω (gignṓskō, “to come to know”), from Proto-Indo-European *ǵneh₃- (“to know”).[2] The noun goes back to the Greek phrase διαγνωστική (diagnōstikḗ) (with τέχνη (tékhnē) understood), "the art of distinguishing diseases".[4][7][8] The OED compares French diagnostique, used in French in the 17th century.[4]

Earliest recorded meaning

Relating to diagnosis, as an adjective, and diagnosis itself, as a noun: both in 1625, in J. Hart's Anatomie of Urines.[4][6]

Semantic evolution

From the 1640s and 1650s the word described a symptom or trait that marks one disease, or one kind of plant or animal, off from others: a diagnostic is a distinctive sign.[4][8] The biological use of the adjective is recorded from 1862.[4] In the 1950s computing took the medical idea over for programs that find faults in a system (1953) and for the messages they produce (1963), part of a wider transfer of words from healing to computing in the second half of the 20th century.[4][9]

Timeline

  • 1625 – of diagnosis; also as a noun, diagnosis.[4][6]
  • 1646 – a distinguishing characteristic, in general use.[4]
  • 1651 – a distinctive symptom of a disease.[4]
  • 1862 – in biology, characteristic of a species or group.[4]
  • 1953 – of a computer program, designed to find faults.[4]
  • 1962 – diagnostics in physics, methods for studying a plasma.[4]
  • 1963 – a computer message that helps identify an error.[4]

Modern meaning

Adjective

  1. Relating to or used in diagnosis: diagnostic tests.
  2. Of a symptom or feature: distinctive enough to identify a disease or problem.
  3. (biology) Characteristic of a particular species or group.
  4. (computing) Of a program or routine: designed to detect and report faults.

Noun

  1. A distinctive symptom or characteristic.
  2. diagnostics: the practice or techniques of diagnosis.
  3. A test, instrument or technique used in diagnosis.
  4. (computing) A program that detects faults, or a message that it produces.

Word family

  • diagnostically
  • diagnostician
  • diagnosticate
  • immunodiagnostic
  • postdiagnostic
  • prediagnostic

References

  1. ^ a b Wiktionary, the free dictionary, https://en.wiktionary.org
  2. ^ a b c Harper, Douglas. Online Etymology Dictionary, https://www.etymonline.com
  3. ^ The American Heritage Dictionary of the English Language (online 2024), 5th ed., Boston: Houghton Mifflin Harcourt
  4. ^ a b c d e f g h i j k l m n Oxford English Dictionary Online (accessed March 2026), Oxford: Oxford University Press
  5. ^ Klein, Ernest. A Comprehensive Etymological Dictionary of the English Language. 2 vols. Amsterdam: Elsevier, 1966–1967.
  6. ^ a b c Merriam-Webster Unabridged Dictionary (2024), online ed., Springfield, Mass.: Merriam-Webster
  7. ^ Stevenson, Angus, ed. (2010), Oxford Dictionary of English, 3rd ed., Oxford: Oxford University Press
  8. ^ a b Shorter Oxford English Dictionary on Historical Principles (2002), 5th ed., ed. William R. Trumble and Angus Stevenson, Oxford: Oxford University Press
  9. ^ Mapping Metaphor with the Historical Thesaurus, University of Glasgow, mappingmetaphor.arts.gla.ac.uk