The Collaborative International Dictionary of English v.0.48:
Croupy \Croup"y\ (kr[=oo]p"[y^]), a. Of or pertaining to croup; resembling or indicating croup; as, a croupy cough. [1913 Webster]WordNet (r) 3.0 (2006):
croupy adj 1: resembling or arising from or indicating croup