The Collaborative International Dictionary of English v.0.48:
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. [1913 Webster]WordNet (r) 3.0 (2006):
premonitory adj 1: warning of future misfortune [syn: precursory, premonitory]