The Collaborative International Dictionary of English v.0.48:

Liquefiable \Liq"ue*fi`a*ble\ (l[i^]k"w[-e]*f[imac]`[.a]*b'l),
   a. [Cf. F. liqu['e]fiable. See Liquefy.]
   Capable of being changed from a solid to a liquid state.
   [1913 Webster]

WordNet (r) 3.0 (2006):

liquefiable
    adj 1: capable of being liquefied [syn: liquefiable,
           liquifiable]