[ dahy-uh g-nos-tik ]
/ ˌdaɪ əgˈnɒs tɪk /


of, relating to, or used in diagnosis.
serving to identify or characterize; being a precise indication.


a symptom or characteristic of value in diagnosis.
Medicine/Medical. a device or substance used for the analysis or detection of diseases or other medical conditions.
  1. a message output by a computer diagnosing an error in a computer program, computer system, or component device.
  2. a program or subroutine that produces such messages.

Origin of diagnostic

1615–25; < Greek diagnōstikós, equivalent to diagnōst(ós) distinguished (akin to diágnōsis; see diagnosis) + -ikos -ic
Related formsdi·ag·nos·ti·cal·ly, adverbpost·di·ag·nos·tic, adjectivepre·di·ag·nos·tic, adjective
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for diagnostic

British Dictionary definitions for diagnostic


/ (ˌdaɪəɡˈnɒstɪk) /


of, relating to, or of value in diagnosis


med any symptom that provides evidence for making a specific diagnosis
a diagnosis
Derived Formsdiagnostically, adverb
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 diagnostic


1620s (adjective and noun), from Greek diagnostikos "able to distinguish," from diagnostos, verbal adjective from diagignoskein (see diagnosis). Related: Diagnostics.

Online Etymology Dictionary, © 2010 Douglas Harper

Medicine definitions for diagnostic


[ dī′əg-nŏstĭk ]


Of, relating to, or used in a diagnosis.
Serving to identify a particular disease; characteristic.


diagnostics The art or practice of medical diagnosis.
A symptom or a distinguishing feature serving as supporting evidence in a diagnosis.
An instrument or a technique used in medical diagnosis.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.