di·ag·nos·tic
ˌdī-ig-ˈnä-stik
-əg-
variants
or less commonly diagnostical
ˌdī-ig-ˈnä-sti-kəl
-əg-
1
a
: of, relating to, or used in diagnosis
a diagnostic tool
b
: using the methods of or yielding a diagnosis
diagnostic tests
2
: serving to distinguish or identify
a diagnostic feature
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Merriam-Webster unabridged
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