di·​ag·​nose | \ ˈdī-ig-ˌnōs How to pronounce diagnose (audio) , -ˌnōz, ˌdī-ig-ˈnōs How to pronounce diagnose (audio) , -ˈnōz, -əg- \
diagnosed; diagnosing

Definition of diagnose

transitive verb

1a : to recognize (something, such as a disease) by signs and symptoms The other method of diagnosing gallstones is through an ultrasound examination, which has the advantages of being simple, safe and quick.— G. Timothy Johnson Pulmonary embolus was diagnosed in two of the actively treated patients …— Richard D. Sautter et al.
b : to recognize a disease or condition in The physicist and cosmologist was diagnosed with Lou Gehrig's disease when he was a 21-year-old student at Cambridge University.— Maria Cheng
2 : to analyze the cause or nature of The mechanic diagnosed the problem with the engine.

intransitive verb

: to identify a disease from its signs and symptoms : to make a diagnosis

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Other Words from diagnose

diagnosable or diagnoseable \ ˌdī-​ig-​ˈnō-​sə-​bəl How to pronounce diagnose (audio) , -​əg-​ , -​zə-​ \ adjective

Examples of diagnose in a Sentence

The test is used to help in diagnosing heart disease. Thousands of new cases have been diagnosed in the past year. The doctor was unable to diagnose the skin condition. a new doctor with little experience diagnosing patients The mechanic was unable to diagnose the problem.
Recent Examples on the Web Timeliness is crucial to diagnose conditions that can be treated if caught early, preventing babies from suffering brain damage, physical disabilities and death. jsonline.com, 29 Apr. 2022 The 75-year-old Venter told the Union-Tribune that UCSD paid $25 million for the institute, which will expand the university’s already huge effort to find ways to prevent, diagnose and treat disease, especially those arising from bad genes. Gary Robbins, San Diego Union-Tribune, 27 Apr. 2022 This feature can be used to indicate hypertension, but the scale doesn’t diagnose health issues. Maren Estrada, BGR, 27 Apr. 2022 Your doctor might order other tests to diagnose your hoarseness, including a throat culture, X-rays of the neck, a CT scan, and blood tests. Korin Miller, Health.com, 10 Feb. 2022 The foundation lies on the premise that if physicians assess better, diagnose faster and offer the optimal therapy program to patients, this may impact patient compliance and create better outcomes and cost savings. Joao Mendes-roter, Forbes, 28 Jan. 2022 That helps physicians diagnose a wide range of viral, bacterial, and fungal infectious diseases, saving lives in the process. Rey Mashayekhi, Fortune, 22 Oct. 2021 This federal program allows manufacturers to communicate with FDA experts during the pre-market review phase of devices intended to treat or diagnose life-threatening or debilitating disease or conditions. Laura Garcia, San Antonio Express-News, 15 Mar. 2021 And ventricular tachycardias can be caused by other health problems that doctors would be able to diagnose and identify. Julie Mazziotta, PEOPLE.com, 13 Apr. 2022 See More

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'diagnose.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

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First Known Use of diagnose

circa 1841, in the meaning defined at transitive sense 1a

History and Etymology for diagnose

back-formation from diagnosis

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Learn More About diagnose

Time Traveler for diagnose

Time Traveler

The first known use of diagnose was circa 1841

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Statistics for diagnose

Last Updated

12 May 2022

Cite this Entry

“Diagnose.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/diagnose. Accessed 22 May. 2022.

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More Definitions for diagnose


di·​ag·​nose | \ ˈdī-əg-ˌnōs How to pronounce diagnose (audio) \
diagnosed; diagnosing

Kids Definition of diagnose

: to recognize (as a disease) by signs and symptoms The test is used for diagnosing strep throat.


di·​ag·​nose | \ ˈdī-ig-ˌnōs How to pronounce diagnose (audio) , -ˌnōz How to pronounce diagnose (audio) , ˌdī-ig-ˈ, -əg- \
diagnosed; diagnosing

Medical Definition of diagnose

transitive verb

1 : to recognize (as a disease) by signs and symptoms
2 : to diagnose a disease or condition in diagnosed the patient

Other Words from diagnose

diagnosable also diagnoseable \ ˌdī-​ig-​ˈnō-​sə-​bəl, -​əg-​, -​zə-​ How to pronounce diagnose (audio) \ adjective


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