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diagnose

[dahy-uh g-nohs, -nohz, dahy-uh g-nohs, -nohz]
verb (used with object), di·ag·nosed, di·ag·nos·ing.
  1. to determine the identity of (a disease, illness, etc.) by a medical examination: The doctor diagnosed the illness as influenza.
  2. to ascertain the cause or nature of (a disorder, malfunction, problem, etc.) from the symptoms: The mechanic diagnosed the trouble that caused the engine knock.
  3. to classify or determine on the basis of scientific examination.
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verb (used without object), di·ag·nosed, di·ag·nos·ing.
  1. to make a diagnosis.
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Origin of diagnose

First recorded in 1860–65; back formation from diagnosis
Related formsdi·ag·nos·a·ble, adjectiveun·der·di·ag·nose, verb (used with object), un·der·di·ag·nosed, un·der·di·ag·nos·ing.un·di·ag·nos·a·ble, adjectiveun·di·ag·nosed, adjectivewell-di·ag·nosed, adjective
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for underdiagnosed

diagnose

verb
  1. to determine or distinguish by diagnosis
  2. (tr) to examine (a person or thing), as for a disease
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Derived Formsdiagnosable, adjective
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for underdiagnosed

diagnose

v.

1861, back-formation from diagnosis. Related: Diagnosed; diagnosing.

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Online Etymology Dictionary, © 2010 Douglas Harper

underdiagnosed in Medicine

diagnose

(dīəg-nōs′, -nōz′)
v.
  1. To distinguish or identify a disease by diagnosis.
  2. To identify a person as having a particular disease or condition by diagnosis.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.