DictionaryRoot: gignōskein
Greek
gignōskein
to learn, come to know
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noun
diagnosis
dye-ug-NOH-sis/ˌdaɪəɡˈnəʊsɪs/
Identification of the nature or cause of a disease or problem.
Etymology
The pieces express knowing thoroughly or knowing things apart. This became discerning or distinguishing, then specifically recognizing a disease by the symptoms that distinguish it.