When you turn a solid into a liquid, like when you set an ice cube in the sunshine and watch it melt into a puddle of water, you liquefy it.

You can liquefy a solid by heating it until it melts, and you can also say the substance itself liquefies. A jar of coconut oil that's hard and solid in the refrigerator will liquefy if you leave it on the counter on a warm summer day. The Latin root of liquefy is liquefacere, "make liquid," from liquere, "be fluid," and facere, "to make."

Definitions of liquefy
  1. verb
    make (a solid substance) liquid, as by heating
    liquefy the silver”
    synonyms: liquidise, liquidize, liquify
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    type of:
    alter, change, modify
    cause to change; make different; cause a transformation
  2. verb
    become liquid
    “The garden air overnight liquefied into a morning dew”
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    type of:
    change state, turn
    undergo a transformation or a change of position or action
  3. verb
    become liquid or fluid when heated
    “the frozen fat liquefied
    synonyms: flux, liquify
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    condense, distil, distill
    undergo condensation; change from a gaseous to a liquid state and fall in drops
    dethaw, dissolve, melt, thaw, unfreeze, unthaw
    become or cause to become soft or liquid
    become plastic or fluid or liquefied from heat
    melt or become liquid by absorbing moisture from the air
    de-ice, defrost, deice
    make or become free of frost or ice
    type of:
    change integrity
    change in physical make-up
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