[ 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 forms

di·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 Forms

diagnostically, 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

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.