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
Jijo Malayil, Interesting Engineering, 28 Oct. 2025
Determining inclusion in the 13% To assess organizational alignment, EDB offers a 30-second diagnostic test based on 15,000 simulations.
—Wyles Daniel, USA Today, 27 Oct. 2025
Stan Choe, Fortune, 21 Oct. 2025
Overall clinical diagnostics core revenue increased low-single-digits versus the year-ago period, or a high single-digit rate when excluding China.
—Zev Fima, CNBC, 21 Oct. 2025
See All Example Sentences for diagnostic
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Adjective
According to the firm, the streamlined approach enhances efficiency, reduces downtime, and delivers high-quality data faster, making Fli Technology an ideal solution for operators seeking safe, reliable, and cost-effective well monitoring and diagnostic capabilities across various environments.
—Jijo Malayil, Interesting Engineering, 28 Oct. 2025
Determining inclusion in the 13% To assess organizational alignment, EDB offers a 30-second diagnostic test based on 15,000 simulations.
—Wyles Daniel, USA Today, 27 Oct. 2025
Noun
Halliburton, the services provider for oil and gas producers, and Danaher, the life sciences and diagnostics company, also jumped to gains of at least 8% after delivering better profit for the latest quarter than analysts expected.
—Stan Choe, Fortune, 21 Oct. 2025
Overall clinical diagnostics core revenue increased low-single-digits versus the year-ago period, or a high single-digit rate when excluding China.
—Zev Fima, CNBC, 21 Oct. 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 30 Oct. 2025.
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