Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
* dĭurno, āre, v. n. [diurnus], to last long, exist long, Quadrig. ap. Gell. 17, 2, 16; and ap. Non. 100, 20 (inusitate dixit pro diu vivere, Gell. l. l.).