Source : Webster's Revised Unabridged Dictionary (1913)

Liquefy \Liq"ue*fy\ (-f[imac]), v. t. [imp. & p. p. {Liquefied}
   (-f[imac]d); p. pr. & vb. n. {Liquefying} (-f[imac]`[i^]ng).]
   [F. liqu['e]fier, L. liquere to be liquid + facere, -ficare
   (in comp.), to make. See {Liquid}, and {-fy}.]
   To convert from a solid form to that of a liquid; to melt; to
   dissolve; and technically, to melt by the sole agency of
   heat.

Source : WordNet®

liquefied
     adj 1: reduced to a liquid state; "liquefied petroleum gas" [syn: {liquified}]
     2: reduced to liquid form by heating; "a mass of molten rock"
        [syn: {molten}, {liquified}]

liquefy
     v 1: become liquid; "The garden air overnight liquefied into a
          morning dew"
     2: make (a solid substance) liquid, as by heating; "liquefy the
        silver" [syn: {liquify}, {liquidize}, {liquidise}]
     3: become liquid or fluid  when heated; "the frozen fat
        liquefied" [syn: {flux}, {liquify}]
     [also: {liquefied}]

liquefied
     See {liquefy}