The Collaborative International Dictionary of English v.0.48:
Preclusive \Pre*clu"sive\, a. Shutting out; precluding, or tending to preclude; hindering. -- Pre*clu"sive*ly, adv. [1913 Webster]WordNet (r) 3.0 (2006):
preclusive adj 1: made impossible [syn: preclusive, obviating(a)]