The Collaborative International Dictionary of English v.0.48:

Liquescent \Li*ques"cent\ (l[-i]*kw[e^]s"sent), a. [L.
   liquescens, p. pr. of liquescere to become liquid, incho. fr.
   liquere to be liquid.]
   Tending to become liquid; inclined to melt; melting.
   [1913 Webster]

WordNet (r) 3.0 (2006):

liquescent
    adj 1: becoming liquid [syn: liquescent, melting]