  The finite-size effect on the evolution of Griffiths phase (GP) is studied
using nanoparticles of half-doped manganite Pr$_{0.5}$Sr$_{0.5}$MnO$_{3}$ with
different average particle sizes but having similar structural parameters. All
the samples exhibit pronounced GP behavior. With reducing particle size, the
Griffiths temperature remains almost unchanged but the characteristic critical
temperature $T_c^R$ decreases and the GP properties are strengthened. It is
noteworthy that the shift of $T_c^R$ follows finite-size scaling with the
particle size revealing an exotic interplay between the GP properties and the
sample dimension. This reinforces an earlier proposal of length-scale related
evolution of GP.
