adiagnostic
adjective
adi·ag·nos·tic
¦ā-ˌdī-əg-¦nä-stik
: having the constituents not distinctly separated but blending together in polarized light under the microscope —used of a rock texture
Word History
Etymology
International Scientific Vocabulary a- entry 2 + diagnostic; originally formed as German adiagnostisch
First Known Use
circa 1909, in the meaning defined above