The Collaborative International Dictionary of English v.0.48:
expandable \expandable\ adj. able to expand or to be expanded. Syn: expandible, expansible, expansile. [WordNet 1.5 +PJC]WordNet (r) 3.0 (2006):
expandable adj 1: able to expand or be expanded [syn: expandable, expandible, expansible] 2: (of gases) capable of expansion [syn: expandable, expandible, expansible, expansile]