Source : Webster's Revised Unabridged Dictionary (1913)

Premonitory \Pre*mon"i*to*ry\, a. [L. praemonitorius.]
   Giving previous warning or notice; as, premonitory symptoms
   of disease. -- {Pre*mon"i*to*ri*ly}, adv.

Source : WordNet®

premonitory
     adj : warning of future misfortune [syn: {precursory}]