underdiagnose

verb

un·​der·​di·​ag·​nose ˌən-dər-ˈdī-ig-ˌnōs How to pronounce underdiagnose (audio)
-ˌnōz;
-ˌdī-ig-ˈnōs
-ˈnōz
-əg-
underdiagnosed; underdiagnosing; underdiagnoses
Synonyms of underdiagnosenext

transitive verb

: to diagnose (a condition or disease) less often than it is actually present

Word History

First Known Use

1974, in the meaning defined above

Time Traveler
The first known use of underdiagnose was in 1974

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Cite this Entry

“Underdiagnose.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/underdiagnose. Accessed 2 Jul. 2026.

Medical Definition

underdiagnose

transitive verb
un·​der·​di·​ag·​nose -ˈdī-ig-ˌnōs, -ˌnōz; -ˌdī-ig-ˈ, -əg- How to pronounce underdiagnose (audio)
underdiagnosed; underdiagnosing
: to diagnose (a condition or disease) less often than it is actually present
Army neurologists fear that severe brain injuries are being underdiagnosedRonald F. Glasser, Harper's
… the negative effects of underdiagnosing and undertreating pain …Ellen Jan Kleinerman, The Plain Dealer (Cleveland, Ohio)

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