diagnostics

[dahy-uhg-nos-tiks]
noun (used with a singular verb) Medicine/Medical.
the discipline or practice of diagnosis.

Origin:
1660–70; see diagnostic, -ics

Dictionary.com Unabridged

diagnostic

[dahy-uhg-nos-tik]
adjective
1.
of, pertaining to, or used in diagnosis.
2.
serving to identify or characterize; being a precise indication.
noun
3.
diagnosis ( def 1 ).
4.
a symptom or characteristic of value in diagnosis.
5.
Medicine/Medical. a device or substance used for the analysis or detection of diseases or other medical conditions.
6.
Computers.
a.
a message output by a computer diagnosing an error in a computer program, computer system, or component device.
b.
a program or subroutine that produces such messages.

Origin:
1615–25; < Greek diagnōstikós, equivalent to diagnōst(ós) distinguished (akin to diágnōsis; see diagnosis) + -ikos -ic

diagnostically, adverb
postdiagnostic, adjective
prediagnostic, adjective
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
diagnostic (ˌdaɪəɡˈnɒstɪk)
 
adj
1.  of, relating to, or of value in diagnosis
 
n
2.  med any symptom that provides evidence for making a specific diagnosis
3.  a diagnosis
 
diagnostically
 
adv

diagnostics (ˌdaɪəɡˈnɒstɪks)
 
n
(functioning as singular) the art or practice of diagnosis, esp of diseases

Collins English Dictionary - Complete & Unabridged 10th Edition
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Etymonline
Word Origin & History

diagnostic
1620s (adj. and noun), from Gk. diagnostikos "able to distinguish," from diagnostos, verbal adj. from diagignoskein (see diagnosis). Related: Diagnostics.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

diagnostic di·ag·nos·tic (dī'əg-nŏs'tĭk)
adj.

  1. Of, relating to, or used in a diagnosis.

  2. Serving to identify a particular disease; characteristic.

n.
  1. diagnostics The art or practice of medical diagnosis.

  2. A symptom or a distinguishing feature serving as supporting evidence in a diagnosis.

  3. 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.
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Example sentences
In contrast to animals, body scent of sick humans is employed only in medical
  diagnostics.
Sub atomic physics is used routinely in hospitals as part of diagnostics.
As a result, few candidate new diagnostics end up undergoing testing.
There is a critical need for new diagnostics as well as new treatments.
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