di·ag·nos·tic
ˌdī-ig-ˈnä-stik 
-əg-
variants
or less commonly diagnostical
ˌdī-ig-ˈnä-sti-kəl
-əg-
1
a
: of, relating to, or used in diagnosis
a diagnostic tool
b
: using the methods of or yielding a diagnosis
diagnostic tests
2
: serving to distinguish or identify
a diagnostic feature
Examples of diagnostic in a Sentence
Adjective
Ultrasound is now widely used as a diagnostic tool.
One important diagnostic feature of this condition is a mild rash.
Noun
the thesis that moral decline is the infallible diagnostic of a decadent society
Recent Examples on the Web
Sindhya Valloppillil, Forbes.com, 1 July 2025
These same-day surgery centers are more convenient and less expensive for patients by providing care—including diagnostic and preventive procedures—without the need for an overnight stay.
—Newsweek Rankings, MSNBC Newsweek, 30 June 2025
William Jones, USA Today, 1 July 2025
Big Contracts and Consolidation are Choking Pet Tech and Food Startups
What was once a regional diagnostics and technology business has gone national, with industry giants like Mars, Zoetis, and IDEXX locking in long-term contracts with veterinary groups.
—Richard Kestenbaum, Forbes.com, 30 June 2025
See All Example Sentences for diagnostic
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Adjective
Results can be easily shared with a physician, who can then recommend diagnostic follow-ups and a personalized care plan.
—Sindhya Valloppillil, Forbes.com, 1 July 2025
These same-day surgery centers are more convenient and less expensive for patients by providing care—including diagnostic and preventive procedures—without the need for an overnight stay.
—Newsweek Rankings, MSNBC Newsweek, 30 June 2025
Noun
The Mayo Clinic in Rochester, NY, has initiated over 200 AI projects through its Center for Digital Health, integrating artificial intelligence into diagnostics and patient care.
—William Jones, USA Today, 1 July 2025
Big Contracts and Consolidation are Choking Pet Tech and Food Startups
What was once a regional diagnostics and technology business has gone national, with industry giants like Mars, Zoetis, and IDEXX locking in long-term contracts with veterinary groups.
—Richard Kestenbaum, Forbes.com, 30 June 2025
See All Example Sentences for diagnostic
Cite this Entry
“Diagnostic.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/diagnostic. Accessed 10 Jul. 2025.
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