The Collaborative International Dictionary of English v.0.48:
decayable \decayable\ adj. susceptible to decay. Syn: putrescible, putrefiable, spoilable. [WordNet 1.5]WordNet (r) 3.0 (2006):
decayable adj 1: liable to decay or spoil or become putrid [syn: decayable, putrescible, putrefiable, spoilable]