mis·tri·al 
(mĭstrī′əl, -trīl′, mĭs-trīəl, -trīl)
(mĭstrī′əl, -trīl′, mĭs-trīəl, -trīl)n.
A trial that is rendered void and of no legal effect because of some serious procedural error or irregularity or because of the inability of the jury to reach a verdict.