Upper-Intermediate (B2)
IPA: /ˌdaɪəɡˈnɒstɪk/
KK: /daɪəɡˈnɑstɪk/
Definition
Related to identifying a disease or problem through examination or analysis.
Example
The doctor used a diagnostic tool to determine the patient's illness.
Conversation

Have you heard about the new diagnostic tool they released for health check-ups?

Yeah, I read it can help identify issues early on!

Exactly, it seems really useful for catching diseases before they get serious.

I think I might try it out next time I visit the doctor.
Synonyms & Antonyms
Synonyms
identifying
analytical
evaluative
Antonyms
misleading
confusing
obscure
Definition
A tool or method used to identify a disease or condition based on symptoms or signs.
Example
The doctor used a diagnostic tool to determine the patient's illness.
Conversation

Have you ever had to go through a diagnostic test at the clinic?

Yeah, I had one last month for my allergies.

What was the diagnostic process like for you?
Root Explanation
Diagnostic → It is formed from "dia-" (meaning through or across) and "gnosis" (from Greek "gnōsis", meaning knowledge). The word refers to the process of determining knowledge or understanding through examination.
Memory Tip
Think of 'through' ('dia-') leading to 'knowledge' ('gnosis') — that's how diagnostic means determining knowledge about a condition.
Visually Confused Words
adiagnostic
eudiagnostic
agnostic
prediagnostic
diapnotic
dianoetic
serodiagnostic
postdiagnostic